1.

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

Answer»

`a.(9)/(10)`
b. `(1)/(2)((9)/(10))^(4)`
c.`((9)/(10))^(5)+(1)/(2)((9)/(10))^(4)`
d.`(1)/(2)((9)/(10))^(5)`

ANSWER :C


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