#1000 · Algebra · Sequences & series

Sum of alternating powers of two

Find the sum of the first 10 terms of $2, - 4, 8, \dots$ .

~2 minAnswer checked instantlygeometric seriesalternating

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. V. Geometrical Progression, Examples V.a, No. 4

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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).