A Statement followed by Conclusion-I and Conclusion-II is given below. You have to take the Statement to be true even if it seems to be at variance from the commonly known facts. Read all Conclusions and then decide which of the given Conclusion(s) logically follows/follow from the Statement, disregarding the commonly known facts.
- Statement: Some radios are mobiles. All mobiles are computers. Some computers are watches.
- Conclusion-I: Certainly some radios are watches.
- Conclusion-II: Certainly some mobiles are watches.
Which one of the following is correct?
Answer & explanation
Answer: (d) Neither Conclusion-I nor Conclusion-II
The only link to watches is 'some computers', and those computers need not include any mobile or radio. A diagram with the watches placed away from the mobiles fits every statement, so neither 'certainly' conclusion is forced.
- Some radios are mobiles and all mobiles are computers, so some radios are computers.
- 'Some computers are watches' does not say which computers.
- Draw the watches overlapping only the part of 'computers' that has no mobile and no radio — all three statements still hold.
- In that diagram no radio and no mobile is a watch, so neither conclusion is certain.
- ✗ Conclusion-I Radios reach watches only through two 'some' links; a radio being a watch is possible but not certain.
- ✗ Conclusion-II All mobiles are computers, but the computers that are watches may be the ones that are not mobiles.
Remember · A 'certainly' conclusion must hold in every possible diagram — try to draw one where it fails.
Question and answer: UPSC's official GS Paper II (2021, Series A) — paper ↗ · answer key ↗. Explanation: Minimalist IAS, checked 30 Sept 2026 (how we verify). ·