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panky September 20th, 2016 02:11 AM

Binomial Series Sum
Sum of series $\displaystyle \displaystyle \sum_{0\leq i<j\leq n}j\binom{n}{i}$

abdallahhammam September 20th, 2016 02:51 AM

here is a starting point

write your sum S as



and use $1+2+3+....K=\frac{K(K+1)}{2}$

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