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A box contains 100 pens of which 10 are ...

A box contains 100 pens of which 10 are defective. What is the probability that out of a sample of 5 pens drawn one by one with replacement at most one is defective? a. `(9/(10))^5` b. `1/2(9/(10))^4` c. `1/2(9/(10))^5` d. `(9/(10))^5+1/2(9/(10))^4`

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