3 balls are drawn from a bag containing
4 red and 2 green balls. What is the
probability that exactly two of them are
red?
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Answer:
All possible case in drawing 3 balls from 12
12
C
3
=
3!9!
12!
=220
Fovourable cases to draw exactly 2 red wall
5
C
2
×
7
C
1
=
2!3!
5!
×
1!6!
7!
=70
Hence the required probability =
220
70
=
22
7
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