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There are two coins, one unbiased with p...

There are two coins, one unbiased with probability `(1)/(2)` of getting heads and the other one is biased with probability `(3)/(4)` of getting heads. A coin is selected at random and tossed. It shows heads up. Then the probability that the unbiased coin was selected is

A

`(2)/(3)`

B

`(3)/(5)`

C

`(1)/(2)`

D

`(2)/(5)`

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