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NDA Math Probability Part 2
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Question : 36
Total: 59
A committee of 3 is to be formed from a group of 2 boys and 2 girls. What is the probability that the committee consists of 2 boys and 1 girl?
[NDA-I 2020]
2
3
1
4
3
4
1
2
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Solution:
👈: Video Solution
Number of ways of selecting 2 boys out of 2 boys
=
2
C
2
=
1
Number of ways of selecting 1 girl out of 2 girls
=
2
C
1
=
2
Number of ways of selecting 3 out of 4 persons
=
4
C
3
=
4
.
∴ Required probability
=
2
C
1
×
2
C
2
4
C
3
=
2
×
1
4
=
1
2
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