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Three students A, B and C are to take pa...

Three students A, B and C are to take part in a swimming competition. The probability of A's winning or B's winning each is 3 times the probability of C's winning. The probability of C 's winning if there is no tie is . (A) `4/7` (B) `3/7` (C) `2/7` (D) `1/7`

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