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Mathematics, 21.03.2020 02:00 nssjdjsididiodododod

Use the binomial theorem to find a closed form expression equivalent to the following sums:
(a) ⁿΣₖ₌₀ ( ⁿₖ ) 3ᵏ (-1)ⁿ⁻ᵏ
(b) ⁿΣₖ₌₀ ( ⁿₖ ) 2ᵏ

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