7. Find a closed formula for each of these recursively defined sequences. (a) a₁ a₁ = 4 and an+1 = an + 5 for n ≥ 1 (b) a₁ = 1 and an+1 = -an for n ≥ 1 (c) a₁ = 3 and an+1 = an for n ≥ 1 oli lo sarist istov

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