Ononot — A sequence satisfies an = 2a{n-1} - a{n-2} with a3 = 11 and

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Recurrence Relationshard

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A sequence satisfies $a_n = 2a_{n-1} - a_{n-2}$ with $a_3 = 11$ and $a_4 = 24$ . What is $a_2$ ?