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KEAM 2018 Math Paper
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© examsnet.com
Question : 59
Total: 120
Two dice of different colours are thrown at a time. The probability that the sum is either 7 or 11 is
7
36
2
9
2
3
5
9
6
7
Validate
Solution:
Probability of sum of 7
=
(
6
,
1
)
,
(
5
,
2
)
,
(
4
,
3
)
,
(
3
,
4
)
,
(
2
,
5
)
,
(
1
,
6
)
and probability of sum of 11
=
(
6
,
5
)
,
(
5
,
6
)
P
(
x
)
=
6
36
+
2
36
=
8
36
=
2
9
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