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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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CENGAGE ENGLISH-SEQUENCES AND SERIES-All Questions
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