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Two coins are available, one fair the ot...

Two coins are available, one fair the other two- headed. Choose a coin and toss it once, assume that the unbiased coin is chosedn with probability `(3)/(4)`. Given that the outcome is head, the probability that the two-headed coin was chosedn is

A

`(3)/(5)`

B

`(2)/(5)`

C

`(1)/(5)`

D

`(2)/(7)`

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