1.

A box has 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 ?

Answer»

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

Answer :D


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