TR-MO-R1 2008 Problem 11

Bir $(a_n)$ dizisi $a_1 = 1$ , $a_2 = 5$ ve her $n \geq 2$ için $a_{n+1} - 2a_n + a_{n-1} = 7$ şeklinde tanımlanmaktadır. Buna göre $a_{17}$ kaçtır?

a) 895 b) 900 c) 905 d) 910 e) Hiçbiri

Official text Turkish Mathematical Olympiad, first round 2008 official paper, page 4. Quoted with source.

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