" If "sum(r=1)^(n)cos^(-1)x(r)=0," then ...

" If "sum_(r=1)^(n)cos^(-1)x_(r)=0," then "sum_(r=)^(n)x_(r)" equals to "

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If sum_(r=1)^(n)Cos^(-1)x_(r)=0," then "sum_(r=1)^(n)x_(r) equals to

If sum_(r=1)^(n)cos^(-1)x_(r)=0, then sum_(r=1)^(n)x_(r) equals to

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

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

If a_(n)=sum_(r=0)^(n)(1)/(nC_(r)), then sum_(r=0)^(n)(r)/(nC_(r)) equals

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

If sum_(r=1)^n I(r)=(3^n -1) , then sum_(r=1)^n 1/(I(r)) is equal to :

If a_n=sum_(r=0)^n1/(""^nC_r) , then sum_(r=0)^nr/(""^nC_r) equals :

If a_n=sum_(r=0)^n1/(nC_r), then sum_(r=0)^n r/(nC_r) equals

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