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A pair of unbiased dice are rolled toget...

A pair of unbiased dice are rolled together till a sum of either 5 or 7 is obtained. Then find the probability that 5 comes before 7.

A

`(2)/(7)`

B

`(2)/(5)`

C

`(3)/(7)`

D

None of these

Text Solution

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The correct Answer is:
(a)
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