If the first second and third term of AP are a,b and 2a respectively. Then the sum of the AP 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 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

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

The first, second and middle terms of an A.P. are a, b, c, respectively. Then the sum of all terms of the A.P. is

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

If first term, second term and last term of an A.P are a,b and 2a respectively then there sum is……

First , second and middle terms of an A.P. are a,b,c respectively . The sum of AP 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)) .