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EAMCET Engineering 2006 Solved Paper
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© examsnet.com
Question : 122
Total: 160
Seven balls are drawn simultaneously from a bag containing 5 white and 6 green balls. The probability of drawing 3 white and 4 green balls is :
7
11
C
7
5
C
3
+
6
C
4
11
C
7
5
C
2
6
C
2
11
C
7
6
C
3
5
C
4
11
C
7
Validate
Solution:
Number of ways to get 3 white and 4 green balls from 5 white and 6 green balls
=
5
C
3
×
6
C
4
=
5
C
2
×
6
C
2
and total number of ways
=
11
C
7
∴
Required probability
=
n
(
E
)
n
(
S
)
=
5
C
2
×
6
C
2
11
C
7
© examsnet.com
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