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

If the pth term of an A.P. is q and the qth term isp, then find its rth term.

the pth term of an A.P is q and and the qth tern is p find the mth term.

If the pth term of an A.P. is q and its qth term is p then its mth term is :

If the pth term of an A.P.is q and the qth term is p, then find its rth term.

If the sum of first 10 terms of an A.P is 60 and sum of first 15 terms is -165 then find the sum of its n terms