Find the nth term {an} of the geometric sequence. When given, r is the common ratio.-4, -12, -36, -108, -324, ...
A. an = -4 ? 3n
B. an = -4 ? 3n
C. an = a1 + 3n
D. an = -4 ? 3n-1
Answer: D
Mathematics
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A. 
in.
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C. 
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Mathematics