Chapter 15: Q6MP (page 776)
Find the number of ways of putting 2 particles in 5 boxes according to the different kinds of statistics.
Short Answer
The solution is derived as mentioned below.
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Chapter 15: Q6MP (page 776)
Find the number of ways of putting 2 particles in 5 boxes according to the different kinds of statistics.
The solution is derived as mentioned below.
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Two dice are thrown. Use the sample space (2.4) to answer the following questions.
(a) What is the probability of being able to form a two-digit number greater than
33 with the two numbers on the dice? (Note that the sample point 1, 4 yields
the two-digit number 41 which is greater than 33, etc.)
(b) Repeat part (a) for the probability of being able to form a two-digit number
greater than or equal to 42.
(c) Can you find a two-digit number (or numbers) such that the probability of
being able to form a larger number is the same as the probability of being able
to form a smaller number? [See note part (a)]
If 4 letters are put at random into 4 envelopes, what is the probability that at least one letter gets into the correct envelope?
(a) Acandy vending machine is out of order. The probability that you get a candybar (with or without return of your money) is, the probability that you getyour money back (with or without candy) is , and the probability that youget both the candy and your money back is . What is the probability that youget nothing at all? Suggestion: Sketch a geometric diagram similar to Figure 3.1, indicate regions representing the various possibilities and their probabilities; then set up a four-point sample space and the associated probabilities of the points.
(b) Suppose you try again to get a candy bar as in part (a). Set up the 16-point
sample space corresponding to the possible results of your two attempts tobuy a candy bar, and find the probability that you get two candy bars (andno money back); that you get no candy and lose your money both times; thatyou just get your money back both times.
A thick coin has probability of falling heads, of falling tails, and of standing one edge. Show that if it is tossed repeatedly it has probability 1 of
Eventually standing on edge.
Set up an appropriate sample space for each of Problems 1.1 to 1.10 and use itto solve the problem. Use either a uniform or non-uniform sample space or try both.
You are trying to find instrument A in a laboratory. Unfortunately, someone has put both instruments A and another kind (which we shall call B) away in identical unmarked boxes mixed at random on a shelf. You know that the laboratory has 3 A’s and 7 B’s. If you take down one box, what is the probability that you get an A? If it is a B and you put it on the table and take down another box, what is the probability that you get an A this time?
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