There are 3 coins in a box. One is a two-headed coin,

Chapter 3, Problem 43P

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QUESTION:

Problem 43P

There are 3 coins in a box. One is a two-headed coin, another is a fair coin, and the third is a biased coin that comes up heads 75 percent of the time. When one of the 3 coins is selected at random and flipped, it shows heads. What is the probability that it was the two-headed coin?

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QUESTION:

Problem 43P

There are 3 coins in a box. One is a two-headed coin, another is a fair coin, and the third is a biased coin that comes up heads 75 percent of the time. When one of the 3 coins is selected at random and flipped, it shows heads. What is the probability that it was the two-headed coin?

ANSWER:

Solution

Step 1 of 1

We have to find the probability of getting 2 headed coin when we flip 3 coins

Let H be the event that the coin shows head

All the 3 coins having the equal probability of selecting it them

Then  P(A)=1/3

Let A be the 2 headed coin flipped then P(H/A)=1

Let B be the fair coin flipped, then P(H/B)=0.5

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