← CAT 2021 Slot 2 QA

CAT 2021 Slot 2 QA · Question 20

For a sequence of real numbers x1, x2, ..., xn, if x1 - x2 + x3 - ... + (-1)n + 1xn = n2 + 2n for all natural numbers n, then the sum x49 + x50 equals

  1. A.
    2
  2. B.
    -2
  3. C.
    200
  4. D.
    -200

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