Ononot — Consider an = a{n-1} + a{n-2}. If a1 = 1 and a2 = 3, what is

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Recursioneasy

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Consider $a_n = a_{n-1} + a_{n-2}$ . If $a_1 = 1$ and $a_2 = 3$ , what is $a_4$ ?