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Three persons P, Q and R independentlytr...

Three persons P, Q and R independentlytry to hit a target. If the probabilities oftheir hitting the target are `3/4,1/2 and 5/8` respectively, then the probability that thetarget is hit by P or Q but not by R is:

A

`21/64`

B

`9/64`

C

`15/64`

D

`39/64`

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The correct Answer is:
A
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