# math

In a shop there are 20 customers, 18 of whom will make a purchase. If three customers are selected, one at a time, at random, what is the probability that all will make a purchase?

1. 👍 0
2. 👎 0
3. 👁 182
1. For the probability of all events, multiply the individual probabilities.

Without replacement, 18/20 * 17/19 * 16/18 = ?

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2. 👎 0

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