In a G.P., the sum of the first and last terms is 66 , the product of the second and the last bu...

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In a G.P., the sum of the first and last terms is 66 , the product of the second and the last but one is 128 , and the sum of the terms is 126 . In any case, the difference of the least and greatest terms is
(1) 78
(2) 126
(3) 126
(4) none of these
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