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Question

# Suppose that the methods used by shoppers to pay for merchandise are as shown in the given circle graph. Two shoppers are chosen at random. What is the probability that both shoppers paid for their purchases only in cash?

Solution

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Step 1
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In this task we have to find the probability that

a) both shoppers paid for their purchases only in cash

b) at least one shopper paid in cash

c) neither shopper paid only in cash

First we will solve the part a), then part c), then part b) because we will solve the part b) using the part c).

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