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JEE Advanced 2013 Paper 2
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© examsnet.com
Question : 56
Total: 60
If 2 balls are drawn (without replacement) from a randomly selected box and one of the balls is white and the other ball is red , the probability that these 2 balls are drawn from box B
2
is
116
181
126
181
65
181
55
181
Validate
Solution:
P (Ball drawn from box 2 / one is W is R) =
P
(
A
∩
B
)
P
(
B
)
=
1
3
×
2
×
3
9
C
2
1
3
[
1
×
3
6
C
2
+
2
×
3
9
C
2
+
3
×
4
12
C
2
]
=
2
×
3
×
2
9
×
8
3
×
2
6
×
5
+
2
×
6
×
2
9
×
8
+
3
×
4
×
2
12
×
11
=
1
6
1
5
+
1
6
+
2
11
=
1
6
66
+
55
+
60
55
×
60
=
55
181
© examsnet.com
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