The difference between the fourth and the first term of a GP is 52 and the sum of the first thre....

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The difference between the fourth and the first term of a GP is 52 and the sum of the first three terms is
\( \mathrm{P} \)
26. Then the sum of the first six terms is
(1) 720
(2) 725
(3) 728
(4) 780
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