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OpenStudy (anonymous):
Which of the following is the formula for this geometric sequence? 1, -3, 9, -27,... A. an = -1(3)^n-1 B. an = 1(-3)^n-1 C. an = 3(-1)^n-1
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OpenStudy (anonymous):
ans.: B) a[n] = 1 * (-3)(n-1).
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