If p, q, r, s are in G.P. then show that...

If p, q, r, s are in G.P. then show that
` (q -r )^(2) + ( r -p) ^(2) + ( s-q) ^(2) = ( p -s) ^(2)`

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The correct Answer is:

`= ( p -s) ^(2) = R. H . S.`

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