What is the sum of the first seven terms of the geometric series? 3 plus 12 plus 48 plus 192 plus dot dot dot

The first term is 3, and each term is 4 times the previous one, so the common ratio is 4. The first seven terms are 3, 12, 48, 192, 768, 3,072, and 12,288; their sum is 16,383. Therefore, the correct choice is A, 16,383.

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