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For a biased die the probabilities for d...

For a biased die the probabilities for different faces to turn up are given below

The die is tossed and you are told that either face 1 or 2 has turned up. Then the probability that it is face 1, is

A

`5/21`

B

`5/22`

C

`4/21`

D

`2/11`

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A
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