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JEE Main Math Class 12 Probability Part 1 Questions
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© examsnet.com
Question : 51
Total: 100
Three persons
P
,
Q
and
R
independently try to hit a target. If the probabilities of their hitting the target are
3
4
,
1
2
and
5
8
respectively, then the probability that the target is hit by
P
or
Q
but not by
R
is :
[Online April 8, 2017]
21
64
9
64
15
64
39
64
Validate
Solution:
Required probability =
(
3
4
)
(
1
2
)
(
3
8
)
+
(
1
4
)
(
1
2
)
(
3
8
)
+
(
3
4
)
(
1
2
)
(
3
8
)
=
12
+
9
64
=
21
64
© examsnet.com
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