Quadratic equation

if the (m+1)th, (n+1)th and (r+1)th term of an AP are in GP and 1/m,1/n,1/r are in AP then find the ratio of the first term of an AP to its common diffrence in terms of n.

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integral (1+r) dr = r^2/2+r+constant
r + r^2/2

The question is itself wrong !