Write a recursion formula for the sequence.-4, -12, -36, -108, . . .
A. an = 3an-1, a1 = -4
B. an = an-1 + 3, a1 = -4
C. an = an-1 + 6, a1 = -4
D. an = 6an-1, a1 = -4
Answer: A
Mathematics
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A. 
B. 
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