Find the next number in the series: 10, 3, 20, 6, 30, 9, ?

  1. 34
  2. 40
  3. 12
  4. 45
Answer

B) 40

Two series are mixed together. Odd positions: 10, 20, 30 (step 10); even positions: 3, 6, 9 (step 3). Next is an odd position: 30 + 10 = 40.

Quantitative Reasoning MCQ · More Number Series MCQs · Practise