[" 5.The first,second and last terms of an A.P.are "a,b" and "c" respectively.Show that the sum of "A" ."P" .is "],[((a+c)(b+c-2a))/(2(b-a))]

If the first second and last terms of an A.P.are a,b and 2a respectively,then its sum is

If the first,second and last term of an AP are a,b and 2a respectively,its sum is

If the first, second and last terms of A.P. be a, b, and c respectively, show that the sum of all terms of the A.P. is ((a+c)(b+c-2a))/(2(b-a)) .

The first, second and last terms of an A.P. are a, b, c respectively, then the sum to first n terms is

If the first, second and the last terms of an A.P. are a,b,c respectively, then the sum of the A.P. is

If the first, second and the last terms of an A.P. are a,b,c respectively, then the sum of the A.P. is

The first,second and middle terms of an AP are a,b,c respectively.Their sum is

The first , second and the last terms of an A.P. are a ,b , c respectively. Prove that the sum is ((a+c)(b+c-2a))/(2(b-a)) .