Q 1628101901.     Four persons independently solve a certain problem correctly with probabilities `\frac{1}{2},\ \frac{3}{4},\ \frac{1}{4},\ \frac{1}{8}`. Then the probability that the problem is solved correctly by at least one of them is

JEE 2013 ADVANCED Paper - 1
A

`\frac{235}{256}`

B

`\frac{21}{256}`

C

`\frac{3}{256}`

D

`\frac{253}{256}`

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