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4 August, 11:06

A case of 24 vegetable cans has 1 that is contaminated. 3 cans are to be chosen at random for testing.

a. How many different combinations of 3 cans are there?

b. What is the probability that the contaminated can is selected for testing with any given set of 3 cans?

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  1. 4 August, 11:08
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    How many ways can we pick 3 thing out of a field of 24 if the order does not matter. 24C3 means 24 x 23 x 22 divided by 3 x 2 x 1 or 6

    24 x 23 x 22

    3! (3 x 2 x 1)

    12,144 / 6 = 2,024 combinations of 3 cans.

    The probability that you have the contaminated can in any of those 3 can combinations is 1 in 2,024 or 1/,024
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