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EAMCET Engineering 2007 Solved Paper
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© examsnet.com
Question : 122
Total: 160
A bag contains 6 white and 4 black balls. Two balls are drawn at random. The probability that they are of the same colour, is
1
∕
15
2
∕
5
4/15
7
∕
15
Validate
Solution:
The number of ways to select 2 balls out of 10
=
10
C
2
Number of ways to select 2 balls both white
=
6
C
2
Number of ways to select 2 balls both black
=
4
C
2
∴
The required probability
=
6
C
2
+
4
C
2
10
C
2
=
7
15
© examsnet.com
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