Find the series formed by the first three terms of the sequence an = 2n – 4.

Substitute n = 1, 2, and 3 into aₙ = 2n − 4. The first three terms are 2(1) − 4 = −2, 2(2) − 4 = 0, and 2(3) − 4 = 2. A series adds its terms, so the result is −2 + 0 + 2, choice C.

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