Discussion of Question with ID = 024 under Probability

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Question

45 defective pens are accidentally mixed with 40 good ones. It is not possible to just look at a pen and tell whether it is defective or not. One pen is taken out at random. What is the probability that it is a defective pen?

A

${9/17}$.

B

$47/85$.

C

$10/85$.

D

$14/85$.

Soln.
Ans: a

Out of the total number of pens = 85, the chances favoring defective pen are 45. So the probability is 45/85 = ${9/17}$.


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