Help: sum of binomial coefficents !
Hello!
I cannot figure out how to derive a closed formula for the sum of "the first s" binomial coefficients:
\sum_{k=0}^{s} \left({{n}\atop{k}}\right)
with s<n
Could you please help me find out some trick to derive the formula... I've an exam on...
Help: sum of binomial coefficents !
Hello!
I cannot figure out how to derive a closed formula for the sum of "the first s" binomial coefficients:
\sum_{k=0}^{s} \left({{n}\atop{k}}\right)
with s<n
Could you please help me find out some trick to derive the formula... I've an exam on...