A batch of 50 different automatic typewriters contains exactly 10 defective machines. What is the probability...

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A batch of 50 different automatic typewriters contains exactly10 defective machines. What is the probability of finding:

(c) The first defective machine to be the k-th machine takenapart for inspection in a random sequence of machines?
(d) The last defective machine to be the k-th machine takenapart?

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