In a sequence of numbers, each number other than the first two is the sum of the two immediately preceding numbers from it. If th…

Quantitative Aptitude ·Previously asked in UPSC Civil Services Examination 2026

View the full solved paper: GS Paper II

Question

In a sequence of numbers, each number other than the first two is the sum of the two immediately preceding numbers from it. If the first two numbers in the sequence are 4 and 7, then the sixth number is

  1. A. 29
  2. B. 37
  3. C. 43
  4. D. 47 (Correct answer)

Correct Answer

Option D — 47

Detailed Solution & Explanation

The correct answer is Option D (47).

Key Points

  • Each term is the sum of the two before it, starting 4, 7: 4, 7, 11, 18, 29, 47.
  • The sixth term is 47.

Additional Information

  • This is a Fibonacci-style rule with different seeds; the sixth number is Option D.