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A, B, C try to hit a target simultaneous...

A, B, C try to hit a target simultaneously but independently. Their respective probabilities of hitting the target are `3/4,1/2,5/8`. The probability that target is hit by A or B but not by C is

A

`(21)/(64)`

B

`(7)/(8)`

C

`(7)/(32)`

D

`(9)/(64)`

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The correct Answer is:
A
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