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10 2. An=1-2n/1+2n. 10 2n 2n+1+2n-1. (2n-1)/2^n. A2n <= a2 <= an + 1/10n2.
An=1-2n/1+2n. 10 2n 2n+1+2n-1. (2n-1)/2^n. A2n <= a2 <= an + 1/10n2.

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