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Question

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

A
1112
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B
1114
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C
1314
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D
1115
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Solution

The correct option is A (1112)
Number of good pens =132
Number of defective pens =12
Total pens =132+12=144
Probability of an event (A) is =n(A)n(S)
Where n(A) is the number of favourable outcomes.
n(S) is the total number of outcomes.
Probability of getting good pens = 132144=1112


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