1. Which of the following represents an explicit formula for a given sequence? 1. A(n) = 2 A(n − 1) for n ≥ 2 and A(1) = 3 2. a = 3n - 2 for n ≥ 1 3. an+1 = an +7 for n ≥ 1 and a₁ = 4

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