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Year

CAT 2021

Section

Quantitative

Topic

Progression

Difficulty

Medium

Question

Slot-1

Natural numbers are divided into groups as follows:

  • Group 1: (1)
  • Group 2: (2, 3, 4)
  • Group 3: (5, 6, 7, 8, 9)
  • Group 4: (10 … 16)
    …and so on, where the k‑th group contains (2k–1) numbers.
    What is the sum of the numbers in the 15th group?

6119

7471

4941

6090

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