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

If `A` be one A.M. and `p ,q` be two G.M. `' s` between two numbers, then `2A` is equal to `(p^3+q^3)/(p q)` (b) `(p^3-q^3)/(p q)` (c) `(p^2+q^2)/2` (d) `(p q)/2`

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