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If p ,q be two A.M. ' s and G be one ...

If `p ,q` be two A.M. `' s` and `G` be one G.M. between two numbers, then `G^2=` a)`(2p-q)(p-2q)` (b) `(2p-q)(2q-p)` c)`(2p-q)(p+2q)` (d) none of these

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