**Question 7 (11052)**: Problem Solving, Online Exclusive: GMAT™ Official Guide 2023-2024: Online Question Bank.

**Question 5 (PS25011.02)**: GMAT Online Question Bank (GMAT Official Guide 2021 and beyond)

Video explanation: The sequence $a_1, a_2, a_3,…,a_n,…$ is such that $a_n=\dfrac{a_{n-1}+a_{n-2}}{2}$…

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