If `a_n=sum(1/C(n,r)` from r=0 to n, then `sum(r/C(n,r))`

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

If a_(n)=sum_(r=0)^(n)(1)/(""^(n)C_(r)) then sum_(r=0)^(n)(r)/(""^(n)C_(r)) equal to

If a_n=sum(r=0)^n 1/^nC_r, then sum _(r=0^n r/^nC_r equals (A) (n-1)a_n (B) na_n (C) 1/2na_n (D) none of these

If sum_(r=1)^n r^4= a_n then sum_(r=1)^n(2r-1)^4)= (A) a_(2n)+a_n (B) a_(2n)-a_n (C) a_(2n)-16a_n (D) a_(2n)+16b_n

If sum_(r=m)^(n)hat rC_(m)=^(n+1)C_(m+1), then sum_(r=m)^(n)(n-r+1)^(r)C_(m) is equal to sum_(r=m)^(n)(n-r+1)^(r)C_(m) is equal to

If a_(n)=sum_(r=0)^(n)(1)/(*^(n)C_(r)), the value of sum_(r=0)^(n)(n-2r)/(n^(n)C_(r))