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For a biased die, the probabilities for ...

For a biased die, the probabilities for the different faces to turn up are given by the table

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

A

`(5)/(21)`

B

`(5)/(22)`

C

`(4)/(21)`

D

None of these

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The correct Answer is:
A
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