If pth, qth, rth terms of an A.P. are in...

If pth, qth, rth terms of an A.P. are in G.P. then common ratio of ths G.P. is (A) `(q-r)/(p-q)` (B) `(q-s)/(p-r)` (C) `(r-s)/(q-r)` (D) `q/p`

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