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`

Answer 1

`11/12`

Explanation:

Number of good pens = 132

Number of defective pen = 12

∴ Total pens = 132 + 12 = 144