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Statement of a problem № m246

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A batch of 25 injection-molded parts contains 5 that have suffered excessive shrinkage. (a) If two parts are selected at random, and without replacement, what is the probability that the second part selected is one with excessive shrinkage? (b) If three parts are selected at random, and without replacement, what is the probability that the third part selected is one with excessive shrinkage?

Solution:
A batch of 25 injection-molded parts contains 5 that have suffered excessive shr

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