If the fourth term in a geometric sequence is - 1 and the common ratio is -1, find the explicit formula of the sequence.
A)
an = (1) - (1)n- 1 for n 2 2
B)
an = (1) · (–1)n- 1 for n 2 1
C) an = (– 1) - (1)n - 1 for n 2 1
D) an = (-1) - (-1)" - 1 for n< 1
3:40 PM
7/2/2020
BI
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