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24 February, 20:03

A sample of 4 different calculators is randomly selected from a group containing 1212 that are defective and 3333 that have no defects. find the probability that at least one of the calculators is defective. round to the nearest thousandth.

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  1. 24 February, 20:40
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    There are 45C4 = 148,995 ways to choose 4 calculators out of a group of 45.

    There are 33C4 = 40,920 ways to choose 4 calculators that are not defective.

    The probability that at least one is defective is (148,995 - 40,920) / 148,995 ≈ 0.725.
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