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Three dice, red, blue and green in colour are rolled together. Let B be the event that sum of the numbers shown up is 7. Let A be the event that the red die shows 1. The conditional probability of the events A given B, P (A|B) is

A

`(2)/(7)`

B

`(1)/(6)`

C

`(1)/(7)`

D

`(1)/(3)`

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The correct Answer is:
D
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