If sum(s=1)^n{sum(r=1)^s r}=a n^3+b n^2...

If `sum_(s=1)^n{sum_(r=1)^s r}=a n^3+b n^2+C n` then

If sum(s=1)^n{sum(r=1)^s r}=a n^3+b n^2+C n then
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Prove that sum(r=0)^ssum(s=1)^n^n Cs^n Cr=3^n-1.
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sum(r=1)^(n)r^(3)=f(n) then sum(r=1)^(n)(2r-1)^(3) is equal to
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If sum(r=1)^(n)I(r)=2^(n)-1 then sum(r=1)^(n)(1)/(I(r)) is
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The value of sum(r=0)^(n)sum(s=1)^(n)*^(n)C(5)*^(s)C(r) is
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If sum(r=1)^(n)r^(3)((C(n,r))/(C(n,r-1)))=14^(2) then n=
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sum(r=1)^(n)r(r+1)=((n+a)(n+b)(n+c))/(3) then
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If f (n) = sum(s=1)^n sum(r=s)^n "^nCr "^rCs , then f(3) =
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If sum(s=1)^n{sum(r=1)^s r}=a n^3+b n^2+C n then
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