alleryNumber of subsets of {1, 2, 3, 4, 5} with exactly 3 elements:
A3
B32
CC(5, 3) = 10
D5
Answer & Solution
Correct answer: C. C(5, 3) = 10
k-element subsets of n-element set = C(n, k).
For C(5, 3) = 10. Total subsets = 2⁵ = 32
sum of binomials Σ C(5, k) = 32.
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