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. - Mathematics

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MCQ

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`

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Solution

`11/12`

Explanation:

Number of good pens = 132

Number of defective pen = 12

∴ Total pens = 132 + 12 = 144

Concept: Probability (Entrance Exam)
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2015-2016 (May) Set 1

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