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12 defective pens are accidently mixed w...

`12` defective pens are accidently mixed with `132` good ones. It is not possible to just look at pen and tell whether or not it is defective. One pen is taken out at random from this lot. Find the probability that the pen taken out is good one.

A

` 11/12`

B

` 7/12`

C

` 5/12`

D

` 1/12`

Text Solution

Verified by Experts

The correct Answer is:
A
Total number of pens = 132 + 12 = 144.
Number of good pens = 132.
`:. ` P(getting a good pen) ` = (132)/(144) = 11/12`.
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