If the pth and qth terms of an A.P. be a and b respectively, show that the sum of first (p+q) terms of the A.P. is `(p+q)/(2)(a+b+(a-b)/(p-q))`.

If the P^(th) and q^(th) terms of an A.Pare a and b respectively,then show that the sum of first (p+q) terms of thath A.P is 1/2(p+q) (a+b+(a-b)/(p-q))

The pth and qth terms of an A.P. are x and y respectively. Prove that the sum of (p + q) terms is. (p+q)/(2)[x+y+(x-y)/(p-q)].

The pth and qth terms of an A.P. are x and y respectively. Prove that the sum of (p + q) terms is. (p+q)/(2)[x+y+(x-y)/(p-q)].

The pth and qth terms of an A.P. are x and y respectively. Prove that the sum of (p + q) terms is. (p+q)/(2)[x+y+(x-y)/(p-q)].

In an A.P. the pth and qth terms are respectively a and b. Show that the sum of first p + q terms is (p+q)/2{(a+b)+(a-b)/(p-q)} .

The pth term of an A.P. is a and qth term is bdot Then find the sum of its (p+q) terms.

The pth term of an A.P. is a and qth term is bdot Then find the sum of its (p+q) terms.

The pth term of an A.P. is a and qth term is bdot Then find the sum of its (p+q) terms.

The pth, qth and rth terms of an A.P. are a, b and c respectively. Show that a(q – r) + b(r-p) + c(p – q) = 0

If pth,qth and rth terms of an A.P. are a, b, c respectively, then show that a(q-r)+b(r-p)+c(p-q)=0