How to prove this combinatorial summation?
I expanded $C(m, i)$ and $C(n-1, n-i)$ and clubbed them together but it didn't yield anything useful. Please show me the approach only.
Is this the Chu-Vandermonde identity?
How to prove this combinatorial summation?
I expanded $C(m, i)$ and $C(n-1, n-i)$ and clubbed them together but it didn't yield anything useful. Please show me the approach only.
Is this the Chu-Vandermonde identity?