alleryIf $\binom{10}{3}=\binom{10}{k}$ (with $k\neq 3$), then $k$ equals:
A13
B6
C4
D7
Answer & Solution
Correct answer: D. 7
C(n,r)=C(n,n−r), so C(10,3)=C(10,7) ⟹ k=7.
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