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A, B and C try to hit a target simultane...

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

A

`(21)/(64)`

B

`(7)/(32)`

C

`(9)/(64)`

D

`(7)/(8)`

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