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CGP EDU Academic Team
Published on: August 13, 2026
If X is a set containing n > 1 elements and Y is a set containing m > 1 elements. The number of relations from X to Y is -
Text Solution
Verified by ExpertsThe correct answer is:
A
If there is no restriction, we can select 3 balls out of (2 + 3 + 4) balls in 9 C 3 ways. If black balls are to be excluded, this can be done in 6 C 3 ways. Therefore the number of ways when at least on black ball is included is
9 C 3 – 6 C 3 = 
– 
= 84 – 20 = 64.
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