Let Sn = 2n + A and TN = n2-2n + B, then a + B=______ ．

The sum of the first n terms of ∵ equal ratio sequence {an} is Sn = 2n + A, ∵ a = - 1 ∵ equal difference sequence {BN} is TN = n2-2n + B ∵ B = 0 ∵ a + B = - 1, so the answer is: - 1

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