What is the sum of the first six terms of the geometric series? 2 – 6 + 18 – 54 + ...

The first six terms are 2, −6, 18, −54, 162, and −486. Adding them gives 2 − 6 + 18 − 54 + 162 − 486 = −364, so the sum is −364 (choice B).

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