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Geometric

Geometric

Example 1

Find the sum of the first 7 terms of the geometric sequence -3, 6, -12, 24, -48 …

Step 1. Determine a1, r and n.
GeometricEx1-1 , GeometricEx1-2 , and GeometricEx1-3

Step 2 . To find the series, substitute and solve.
GeometricEx1-4

GeometricEx1-5

GeometricEx1-6

GeometricEx1-7