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Three persons
i.e. ‘P’, ‘Q’ and ‘R’, are given the same puzzle to solve. The probability that ‘P’, ‘Q’ and ‘R’ will solve the puzzle is (2/5), (3/4) and (5/6), respectively. Find the probability that exactly one of them will not solve the puzzle.

A 49/120

B 61/120

C 53/120

D 13/24

E 19/40

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