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find the sum of series nC1+(n+1)C2+(n+2)C3+.........+(n+r-1)Crplease could u help me how to proceed in thesetype of problems
Arun KumarIIT DelhiAskiitians Faculty
Little mistake in above answer
N(C1+C2+......Cr)+( (2-1)C2+(3-1)C3......) SUMMATION Cr + SUMMATION rCrSUMMATION Cr is 2^nAnd to solve rCr write expansion of (1+x)^n and differentiate and then put x=1
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