sum_(r=1)^(n)r*^(2n)C_(r)" is equal to "

sum_(r=1)^(n)(C(n,r))/(r+2) is equal to

(sum_(r=1)^(n)r^(4))/(sum_(r=1)^(n)r^(2)) is equal to

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

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

sum_(r=1)^(n) r^(2)-sum_(r=1)^(n) sum_(r=1)^(n) is equal to

sum_(r=1)^(n) r^(2)-sum_(r=1)^(n) sum_(r=1)^(n) is equal to

What is sum_(r=0)^(1) ""^(n+r)C_(n) equal to ?

The value of sum_(r=0)^(2n)(-1)^(r)*(""^(2n)C_(r))^(2) is equal to :

The value of sum_(r=0)^(2n)(-1)^(r)*(""^(2n)C_(r))^(2) is equal to :