If the pth, qth, and rth terms of an A.P...

If the pth, qth, and rth terms of an A.P. are in G.P., then the common ratio of the G.P. is a.`(p r)/(q^2)` b. `r/p` c. `(q+r)/(p+q)` d. `(q-r)/(p-q)`

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