If p,q,r are in A.P the `p^2(q+r),q^2(r+p),r^2(p+q)` are in :

If p,q,r are in G.P and tan^(-1)p,tan^(-1)q,tan^(-1)r are in A.P then p,q,r satisfies the relation

If a_(1),a_(2),a_(3),…. are in A.P., then a_(p),a_(q),q_(r) are in A.P. if p,q,r are in

If a,b,c be respectively the sum of first p,q,r terms of an A.P. then a/p(q-r) + b/q(r-p) + c/r(p-q) equals :

If p,q,r,s are proportional then ((p-q)(p-r))/(p)=

If p,q and r are in AP,then prove that (p+2q-r)(2q+r-p)(r+p-q)=4pqr