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19 defective pens have accidentally got ...

19 defective pens have accidentally got mixed with 361 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 defective one.

A

`1/20`

B

`1/10`

C

`2/19`

D

`1/19`

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