" 60."sum(r=1)^(n)r(n-r+1)" is equal to:...

" 60."sum_(r=1)^(n)r(n-r+1)" is equal to: "

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sum_(r=1)^n r(n-r) is equal to :

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sum_(r = 1)^(n) r. r! is equal to

If f(n)=sum_(r=1)^(n) r^(4) , then the value of sum_(r=1)^(n) r(n-r)^(3) is equal to

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