1.

If ∑20r=1(r)=a,∑20r=1(r2)=b then the sum of products of 1,2,3,…20 taking two at a time is

Answer»

If 20r=1(r)=a,20r=1(r2)=b then the sum of products of 1,2,3,20 taking two at a time is



Discussion

No Comment Found