m sum_(r=0)^(n)(r+1)C_(r)^(2)" is equal to ":

sum_(r=0)^(n)(""^(n)C_(r))/(r+2) is equal to :

sum_(r=0)^(n)(""^(n)C_(r))/(r+2) is equal to :

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

If a+b=1, then sum_(n=0)^(n)C(n,r)a^(r)b^(n-r) is equal to '

sum_(r=0)^(m)*^(n+r)C_(n) 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

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