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Probability question

2017 · 8 Apr · Shift 1 · Q37

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JEE Main
Mathematics
Probability
2017 · 8 Apr · Shift 1 · Q37

Probability question

2017 · 8 Apr · Shift 1 · Q37

JEE MainMathematicsProbabilityMCQ+4 / −1

Three persons P, Q and R independently try to hit a target. I the probabilities of their hitting the target are

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

and

{5 \over 8}

respectively, then the probability that the target is hit by P or Q but not by R is :

A
${{21} \over {64}}$
B
${{9} \over {64}}$
C
${{15} \over {64}}$
D
${{39} \over {64}}$

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