ANSWERS: 2
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A sub 0 = 0^2 - 1 = -1 A sub 1 = 1^2 - 1 = 0 A sub 2 = 2^2 - 1 = 3 A sub 3 = 3^2 - 1 = 8 etc.
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THANK YOU!!!!!! is it arithmetic or geometric?
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