If 1 ball is taken from 7 red, 5 blue, 4...

If 1 ball is taken from 7 red, 5 blue, 4 white and 4 black balls, then probability that it is blue or black is

A

`3/7`

B

`9/20`

C

`11/20`

D

`4/7`

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The correct Answer is:

B

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