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JEE Main Math Class 12 Probability Part 1 Questions
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© examsnet.com
Question : 19
Total: 100
Four fair dice are thrown independently 27 times. Then the expected number of times, at least two dice show up a three or a five, is ______.
[NA Sep. 05, 2020 (I)]
Your Answer:
Validate
Solution:
Probability of getting at least two 3's or 5's in one trial
=
4
C
2
(
2
6
)
2
(
4
6
)
2
+
4
C
3
(
2
6
)
3
(
4
6
)
+
4
C
4
(
2
6
)
4
=
33
3
4
=
11
27
E
(
x
)
=
n
p
=
27
(
11
27
)
=
11
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