NCERT Class XI Mathematics - Permutations and Combinations - Solutions
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Question : 29
Total: 41
A bag contains 5 black and 6 red balls. Determine the number of ways in which 2 black and 3 red balls can be selected.
Solution:
No. of ways of selecting 2 black balls =
C 2
No. of ways of selecting 3 red balls =
C 3
∴ Required no. of ways of selecting 2 black & 3 red balls =
C 2
C 3
=
×
×
No. of ways of selecting 3 red balls =
∴ Required no. of ways of selecting 2 black & 3 red balls =
=
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