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Four persons independently solve a certain problem correctly with probabilities 1 31 2 4 4 probability that the problem is solved correctly by atleast

Four persons independently solve a certain problem correctly with probabilities 1 31 2 4 4 probability that the problem is solved correctly by atleast one of them, is (a) 235 256 21 256 (b)- (c) and . Then, the 8 [JEE Advanced 2013, 2M] 3 256 (d) 253 256

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