If \( C_{0}+C_{1}+C_{2}+\ldots+C_{n}=256 \), then \( { }^{2 n} C_{2} \) is equal to
(A) 56
(B) 1...
If \( C_{0}+C_{1}+C_{2}+\ldots+C_{n}=256 \), then \( { }^{2 n} C_{2} \) is equal to
(A) 56
(B) 120
(C) 28
(D) 91
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