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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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Parth (parthkohli):
an = 1(-3)n-1. Can I explain or is that enough?
OpenStudy (anonymous):
explain is a must to support your answer...
Parth (parthkohli):
Okay. (-3)^1 = -3 (n - 1 = 1 as n = 2) This is an example.
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