/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 5 There are two boxes: one marked ... [FREE SOLUTION] | 91Ó°ÊÓ

91Ó°ÊÓ

There are two boxes: one marked \(\mathrm{A}\) and one marked B. Each box contains either \(\$ 1\) million or a deadly snake that will kill you instantly. You must open one box. On box A there is a sign that reads: "At least one of these boxes contains \(\$ 1\) million." On box B there is a sign that reads: "A deadly snake that will kill you instantly is in box A." You are told that either both signs are true or both are false. Which box do you open? Be careful! The wrong answer is fatal!

Short Answer

Expert verified
Open Box B; both signs are false, and Box B has the money.

Step by step solution

01

Analyze the Sign on Box A

The sign on Box A states: "At least one of these boxes contains $1 million." If this sign is true, then at least one box, either A or B, must contain the money, ensuring that both boxes do not contain snakes. If it's false, then neither box contains the money, meaning both contain snakes, which doesn't align with having money present.
02

Analyze the Sign on Box B

The sign on Box B states: "A deadly snake that will kill you instantly is in box A." If this sign is true, Box A contains a snake. If it's false, then Box A does not have a snake, which aligns with Box A containing the money if the original statement that both signs are false holds.
03

Determine the Truthfulness of Both Signs

Since both signs are either true or false, we need to check which scenario is valid. If both signs are true, Box A contains a snake (by Box B's sign), which contradicts Box A's sign claiming at least one box has money. Therefore, both signs being true leads to a contradiction.
04

Evaluate Both Signs Being False

If both signs are false, it means: - Box A does not have money. Therefore, Box B must have money. - Box B's statement that 'Box A contains a snake' is false, meaning Box A does not have a snake. Thus, with both signs false, Box B contains the money, and both boxes lack snakes.
05

Conclusion

Based on the possibility that both signs must be false since both can't simultaneously be true, Box B must be the one to open, as it contains the $1 million, with Box A holding neither a snake nor money.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91Ó°ÊÓ!

Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Problem Solving
Problem solving is a critical skill that involves identifying issues, analyzing them, and coming up with a solution. In this exercise, problem solving starts with understanding that there are two boxes, each with specific signs. You must decipher the information despite the fact that your life depends on it.
Start by gathering all relevant data from the problem statement. In our scenario, we know:
  • Each box contains either money or a snake.
  • There are signs on the boxes giving specific information.
  • These signs are either both true or both false.
Dissecting these details is essential. By looking critically at each piece of information, you help form a strategic plan moving forward. After identifying potential outcomes, evaluate their plausibility to derive the best course of action. The approach ensures any decision made is well-grounded and based on logic.
Critical Thinking
Critical thinking goes hand in hand with problem solving, focusing on the ability to analyze and evaluate information objectively to make a reasoned judgment. In the puzzle you are solving, critical thinking requires considering the implications of each sign being true or false.
Think about the statement on each box critically:
  • If Box A's sign is true, at least one box must contain the money, ruling out snakes in both.
  • If Box B's sign is true, Box A would contain the deadly snake.
Through critical analysis, it becomes clear these statements can't both be true as that results in a logical contradiction.
Harnessing critical thinking skills enables you to methodically assess these assertions, ultimately leading you to conclude which logic fits best with the problem parameters. Being analytical in your approach prevents rushed decisions that might overlook key logical outcomes.
Decision Making
Effective decision making requires weighing your options carefully to select the best possible result. In our exercise, you've analyzed all information thoroughly. The next step is to make a final decision.
Since the signs on both boxes present two mutually exclusive outcomes – that both are either true or false – decision making hinges on deducing the most coherent reality. Evaluate the scenarios:
  • If both signs are false, Box B contains the money, as explained.
  • If both signs are true, contradiction is inevitable, proving it invalid.
A logical decision based on this analysis is to open Box B, concluding that the signs must be false. Effective decision making involves confidence in your synthesized knowledge, opting for the most logically sound choice.
Mathematical Logic
Mathematical logic plays a crucial role in structuring your thoughts and reasoning out the problem. Logic gives clarity in identifying and validating statements to discover the truth.
In this exercise, apply logical principles to assess the veracity of statements:
  • "If Box A's statement is true, then at least one box has money," aligns with simple logical implication if indeed true.
  • "If Box B's statement is true, then Box A has a snake," again utilizes logical implication.
Mathematical logic aids in understanding that both true leads to a contradiction, while both false holds the only truth that logically aligns with all given constraints. Logic helps untangle complex scenarios, solidifying how different outcomes interact. In essence, it's a way to see through the clutter and draw rational conclusions.

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

Whom do you trust? Congresswoman Smith opened the Post and saw that a bean- counting scandal had been leaked to the press. Outraged, Smith immediately called an emergency meeting with the five other members of the Special Congressional Scandal Committee, the busiest committee on Capitol Hill. Once they were all assembled in Smith's office, Smith declared, "As incredible as it sounds, I know that three of you always tell the truth. So now I'm asking all of you, Who spilled the beans to the press?" Congressman Schlock spoke up, "It was either Wind or Pocket." Congressman Wind, outraged, shouted, "Neither Slie nor I leaked thes candal." Congressman Pocket then chimed in, "Well, both of you are lying!" This provoked Congressman Greede to say, "Actually, I know that one of them is lying and the other is telling the truth." Finally, Congressman Slie, with steadfast eyes, stated, "No, Greede, that is not true." Assuming that Congresswoman Smith's first declaration is true, can you determine who spilled the beans?

Murray's brother. On another archeological dig, Alley discovered another ancient oil lamp. Again she rubbed the lamp, and a different genie named Curray appeared. After Alley explained her run-in with Murray, Curray responded, "Well, since you know my brother Murray, it's like we're almost family. I'm going to give you four wishes instead of three. What do you say?" Since things had worked out so well the last time, she said, "I already found the Rama Nujan, so now I'd like to find the Dormant Diamond." "You got it," replied Curray. And instantly 12 identical-looking stones appeared. She then used her last three wishes to acquire three balance scales. Each scale was clearly labeled, "One Use Only." Alley looked at the stones and was unable to differentiate any one from the others. Curray explained, "The diamond is embedded in one of the stones. Eleven of the stones weigh the same, but the stone containing the jewel weighs either slightly more or slightly less than the others. I am not telling you which - you must find the right stone and tell me whether it is heavier orl ighter." Alley could use each of the three balance scales exactly once. She was able to select the stone containing the Dormant Diamond from among the 12 identical- looking stones and determine whether it was heavier or lighter than each of the 11 other stones. This puzzle is a challenge. Try to figure out how Alley might have accomplished this feat. Further Challenges

A commuter fly. A passenger train left Austin, Texas, at 12:00 p.m. bound for Dallas, exactly 210 miles away; it traveled at a steady 50 miles per hour. At the same instant, a freight train left Dallas headed for Austin on the same track, traveling at 20 miles per hour. At this same high noon, a fly leaped from the nose of the passenger train and flew along the track at 100 miles per hour. When the fly touched the nose of the oncoming freight train, she turned and flew back along the track at 100 miles per hour toward the passenger train. When she reached the nose of the passenger train, she instantly turned and flew back toward the freight train. She continued turning and flying until, you guessed it, she was squashed as the trains collided head on. How far had the fly flown before her untimely demise?

Tea time. Carmilla Snobnosey lifted the delicate Spode teapot and poured exactly 3 ounces of the aromatic brew into the flowered, shell china teacup. She placed the cream pitcher, also containing exactly 3 ounces, on the Revere silver tray and carried the offering to Podmarsh Hogslopper. "Would you like some tea and cream, Mr. Hogslopper?" she asked. "Yup. Thanks. Ow doggie, sure looks hot. ?'d better cool it down with this here milk," he responded politely and carefully poured exactly 1 ounce of cream into his steaming tea and stirred. "That oughta do it," he said when the steam stopped rising from the tea. "Here, I'll just give you back that there cream." Whereupon he carefully spooned exactly 1 ounce from his teacup back into the creamer. Podmarsh blushed as he looked at a tea leaf or two floating in the cream and realized his faux pas. Caught at an awkward pass, he decided to smooth things over with an intriguing puzzle. "Ya know, Mrs. Snobnosey, I wonder if the tea is more diluted than the cream, or if the cream is more diluted than the tea?" Resolve the dilution problem.

Two rooms are connected by a hallway that has a bend in it so that it is impossible to see one room while standing in the other. One of the rooms has three light switches. You are told that exactly one of the switches turns on a light in the other room, and the other two are not connected to any lights. What is the fewest number of times you would have to walk to the other room to figure out which switch turns on the light? And the follow-up question is: Why is the answer to the preceding question "one"? (Look out: This question uses properties of real lights as well as logic.)

See all solutions

Recommended explanations on Math Textbooks

View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.