For a biased die the probabilities for d...

For a biased die the probabilities for diffenent faces to turn up are given below. The die is thrown and you are told that either face 1 or 2 has turned up. Then the probability that it is face 1, is

A

a) 5/21

B

b) 5/22

C

c) 4/21

D

d) None of these

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