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If a,b,c are in G.P. , prove that the fo...

If a,b,c are in G.P. , prove that the following are also in G.P,
(i) `a^(2),b^(2),c^(2)`
(ii)`a^(3),b^(3),c^(3)`
(iii) `a^(2)+b^(2),ab+bc,b^(2)+c^(2)`

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