Free GMAT Practice Question

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ID: GMAT-QR-PS-045
Section: Quantitative Reasoning - Problem Solving (PS)
Topic: Function
Difficulty level: Hard

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In a certain sequence, $a_1 = 4$, $a_2 = 9$, and $a_n = a_{n-1} - a_{n-2}$ for every integer $n \ge 3$. What is the sum of the first $100$ terms of the sequence?

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