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The probability of winning a race by thr...

The probability of winning a race by three persons `A ,B` , and `C` are `1/2, 1/4` and `1/4`, respectively. They run two races. The probability of `A` winning the second race when `B` , wins the first race is (A) `1/3` (B) `1/2` (C) `1/4` (D) `2/3`

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