संख्याओं के एक अनुक्रम में, पहली दो संख्याओं को छोड़कर, प्रत्येक संख्या अपनी ठीक दो पूर्ववर्ती संख्याओं का योग है। यदि इस अनुक्रम में पहली दो संख्याएँ 4 और 7 हैं, तो छठवीं संख्या क्या है?
Read this question in English
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
(a) 29 · (b) 37 · (c) 43 · (d) 47
उत्तर और व्याख्या · explanation in English
Answer: (d) 47
Build the sequence by adding the last two terms each time: 4, 7, 11, 18, 29, 47. The sixth term is 47.
- Term 3 = 4 + 7 = 11.
- Term 4 = 7 + 11 = 18.
- Term 5 = 11 + 18 = 29.
- Term 6 = 18 + 29 = 47.
Remember · Short sequences: just write the terms out; count positions carefully (option 29 is the fifth term).
Question and answer: UPSC's provisional GS Paper II (2026, Series A) — paper ↗ · answer key ↗. Explanation: Minimalist IAS, checked 30 Sept 2026 (how we verify). ·