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If (m+1)^(th), (n+1)^(th) and (r+1)^(th)...

If `(m+1)^(th)`, `(n+1)^(th)` and `(r+1)^(th)` terms of an A.P. are in G.P. and m,n,r are in H.P., then show that the ratio of the common difference to the first term in the A.P. is `-(2)/(n)`.

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