A box has 100 pens of which 10 are defec...

A box has 100 pens of which 10 are defective. The probability that out of a sample of 5 pens drawn one by one with replacement and atmost one is defective is

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`1/2 (9/10)^(4)`

`1/2 (9/10)^(5)`

`(9/10)^(5) + 1/2(9/10)^(4)`

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