11rosemary 11rosemary

15-08-2016
Advanced Placement (AP)

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

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JunhaoZ JunhaoZ

15-08-2016

This sequence can be modeled by [tex]a_{n}=3^{(n-1)} [/tex], 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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