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If you roll a pair of dice, what is the total number of ways in which you can obtain (a) a 12 ? (b) a 7 ?

Short Answer

Expert verified
There is 1 way to roll a 12 and 6 ways to roll a 7 with two dice.

Step by step solution

01

Count the ways to roll a 12

We need to find out the number of ways to roll a 12 with two dice. This is only possible when both dice show a 6. Hence there is only \(1\) way to get a 12.
02

Count the ways to roll a 7

Next, we need to count the ways we can roll a total of 7 with two dice. The combinations are: (1,6), (2,5), (3,4), (4,3), (5,2), and (6,1). We multiply by \(2\) because we can get the same sum with two different rolls (eg. (1,6) and (6,1) will both sum to 7). Therefore there are \(6\) ways to roll a 7.

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Key Concepts

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

Combinatorics
Combinatorics is a branch of mathematics that deals with counting, arrangement, and combination of objects.
It is fundamental for calculating probabilities, as it helps us quantify the number of ways specific events can occur.
When solving problems involving dice, combinatorics is used to determine all the possible outcomes.
Combinatorics helps us address questions such as, "How many ways can we achieve a specific sum with dice rolls?"
  • For a total of 12 with two dice, we rely on combinatorial counting to determine there is only one possible outcome: both dice showing a 6.
  • For a total of 7, combinatorics is used to list and count all pairs of numbers between the dice. These pairs are: (1,6), (2,5), (3,4), (4,3), (5,2), and (6,1).
By enumerating these possibilities, we can easily answer how many combinations result in a desired sum. Using combinatorics lays the groundwork for calculating probabilities.
Dice Probabilities
Understanding dice probabilities involves comprehending how likely certain outcomes are. A pair of standard six-sided dice has 36 possible outcomes, since each die has 6 faces, leading to combinations of 6 x 6.
To calculate the probability of rolling a particular sum, count the successful outcomes and divide by 36, the total number of possible outcomes.
For instance, the probability of rolling a 12 with two dice is simple.
  • There is only one combination (6,6) that results in 12, thus the probability is \(\frac{1}{36}\).
  • Rolling a 7 has six combinations: (1,6), (2,5), (3,4), (4,3), (5,2), and (6,1), giving a probability of \(\frac{6}{36} = \frac{1}{6}\).
Calculating these probabilities helps to analyze games of chance, assists in decision-making, and enhances our understanding of random events.
Mathematics Education
Mathematics education emphasizes problem-solving, critical thinking, and logic.
It is designed to build foundational skills that apply in daily life and various careers. Teaching probability, especially with tangible examples like dice, can engage students and develop their intuitive understanding of chance.
In mathematics education, practical experiences like rolling dice or using simulations make abstract concepts like probability more relatable.
Providing clear examples and step-by-step solutions, like counting dice outcomes, helps students grasp complex ideas.
  • Using dice, students visually understand concepts of randomness and probability.
  • Exercises that involve counting and probability enhance their ability to interpret data and make predictions.
Incorporating these exercises in the classroom makes mathematical concepts less intimidating and more accessible, cultivating a love for learning mathematics.

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