27 Suppose that, from a box containing D defective and N-D nondefective items, n (D) are drawn...

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27 Suppose that, from a box containing D defective and N-D nondefective items, n (D) are drawn one-by-one, at random and without replacement.

(a) Find the probability that the kth item drawn is defective.

(b) If the (k-1)st item drawn is defective, what is the probability that the kth item is also defective?

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