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Omni-MATH / Let a₁,a₂,a₃,… be a sequence of positive real numbers that satisfies sum_n=k^inftybinomnk a_n=frac15^k for all positive integers k. The value of a₁−a₂+a₃−a₄+⋯ can b… · Discussion

Discussing Let a₁,a₂,a₃,… be a sequence of positive real numbers that satisfies sum_{n=k}^{infty}binom{n}{k} a_{n}=frac{1}{5^{k}} for all positive integers k. The value of a₁−a₂+a₃−a₄+⋯ can b… · Omni-MATH

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