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Probability question

2013 · Shift 1 · Q37

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PYQ Library
JEE Advanced
Mathematics
Probability
2013 · Shift 1 · Q37

Probability question

2013 · Shift 1 · Q37

JEE AdvancedMathematicsProbabilityMCQ+4 / −1

Four persons independently solve a certain problem correctly with probabilities

{1 \over 2},{3 \over 4},{1 \over 4},{1 \over 8}.

Then the probability that the problem is solved correctly by at least one of them is

A
${{235} \over {256}}$
B
${{21} \over {256}}$
C
${{3} \over {256}}$
D
${{253} \over {256}}$

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