Find the next number in the series: 1, 2, 4, 7, 11, ?

  1. 21
  2. 16
  3. 15
  4. 18
Answer

B) 16

Differences are 1, 2, 3, 4 — they change by 1 each time, so the next difference is 5: 11 + 5 = 16.

Quantitative Reasoning MCQ · More Number Series MCQs · Practise