CAT 2019 Slot 2 QA Q5 Progressions & Series

Question 5 of the Quantitative Ability (QA) section, CAT 2019 Slot 2, with CAT's official answer.

Let a1 , a2 be integers such that a1 - a2 + a3 - a4 + ........ +(-1)n-1 an = n , for n ≥ 1. Then a51 + a52 + ........ + a1023 equals
  1. A
    -1
  2. B
    1
  3. C
    0
  4. D
    10

Answer: (B) 1 Progressions & Series MCQ

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