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almond37 [142]
3 years ago
8

1, -3, 9, -27, what is the seventh number in the sequence

Advanced Placement (AP)
1 answer:
dsp733 years ago
4 0
This sequence can be modeled by a_{n}=3^{(n-1)}, and that if n is even, the number becomes negative. So the seventh number would be 3^6, and that is 729, since 7 is odd.
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