Three persons work independently on a problem. If the respective probabilities that they will solve it are 1/3, 1/4 and 1/5, then the probability that none can solve it [MNR 1990; UPSEAT 2000]

Three persons work independently on a problem. If the respective proba

1.	Three persons work independently on a problem. If the respective probabilities that they will solve it are 1/3, 1/4 and 1/5, then the probability that none can solve it [MNR 1990; UPSEAT 2000]
A.	\[\frac{2}{5}\]
B.	\[\frac{3}{5}\]
C.	\[\frac{1}{3}\]
D.	None of these
Answer» B. \[\frac{3}{5}\]

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Three persons work independently on a problem. If the respective probabilities that they will solve it are 1/3, 1/4 and 1/5, then the probability that none can solve it [MNR 1990; UPSEAT 2000]

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