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Let A6 be the sum of first six terms of ...

Let `A_6` be the sum of first six terms of an arithmetic sequence, and `G_6` be the sixth term of a geometric sequence. Both sequences have the same first term, and the common difference of the arithmetic sequence equals the common ratio of the geometrical sequence, which is equal to two. If `A_6/G_6=1/2`, then `G_6 - A_6` equals (i)`1` (ii)`3` (iii)`48` (iv)`144`

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