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Question
Choose the most appropriate option:
12 defective pens are accidentally mixed with 132 good ones. 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 a good one.
Options
`11/12`
`10/12`
`7/12`
`9/12`
Solution
`11/12`
Explanation:
Number of good pens = 132
Number of defective pen = 12
∴ Total pens = 132 + 12 = 144
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