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easy · GMAT Quantitative Reasoning

In a certain production sequence, the n-th term a_n is defined by a_n = a_n-1 + 2n for all integers n > 1.

If a_1 = 5, what is the value of a_4 - a_2?

  1. 18
  2. 8
  3. 9
  4. 14
  5. 23

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