नीचे दो पंक्तियों में दो सर्वसम अनुक्रम दिए गए हैं :
| अनुक्रम-I : | 8 | 4 | 6 | 15 | 52·5 | 236·25 |
| अनुक्रम-II : | 5 | A | B | C | D | E |
अनुक्रम-II के लिए C के स्थान पर क्या प्रविष्टि है ?
Read this question in English
You are given two identical sequences in two rows:
What is the entry in the place of C for the Sequence-II?
(a) 2.5 · (b) 5 · (c) 9.375 · (d) 32.8125
उत्तर और व्याख्या · explanation in English
Answer: (c) 9·375
Sequence-I multiplies by 0.5, 1.5, 2.5, 3.5 and 4.5 in turn. Starting from 5, Sequence-II runs 2.5, 3.75, 9.375, so C = 9.375.
- Sequence-I: 8 × 0.5 = 4, 4 × 1.5 = 6, 6 × 2.5 = 15, 15 × 3.5 = 52.5, 52.5 × 4.5 = 236.25 — the multiplier rises by 1 each time.
- Sequence-II from 5: A = 5 × 0.5 = 2.5, B = 2.5 × 1.5 = 3.75.
- C = 3.75 × 2.5 = 9.375.
- Check: D = 9.375 × 3.5 = 32.8125 — option (d) is the next term, a trap; (a) is A.
Remember · When terms first fall and then shoot up, test multipliers; options often offer the neighbouring terms as traps.
Question and answer: UPSC's official GS Paper II (2021, Series A) — paper ↗ · answer key ↗. Explanation: Minimalist IAS, checked 1 Oct 2026 (how we verify). ·