वर्ष 2025 का कैलेंडर किस वर्ष के कैलेंडर के समान है?
Read this question in English
The calendar for the year 2025 is same for
(a) 2029 · (b) 2030 · (c) 2031 · (d) 2033
उत्तर और व्याख्या · explanation in English
Answer: (c) 2031
2025 is an ordinary year. Adding odd days year by year (2025: 1, 2026: 1, 2027: 1, 2028: 2, 2029: 1, 2030: 1) reaches 7 at the end of 2030, so 2031 begins on the same weekday. It is also an ordinary year, so its calendar matches 2025.
- An ordinary year has 1 odd day; a leap year has 2.
- Odd days from the start of 2025: 1 + 1 + 1 + 2 (2028 is a leap year) + 1 + 1 = 7, a whole number of weeks, by the end of 2030.
- So 1st January 2031 falls on the same weekday as 1st January 2025 (a Wednesday).
- 2031, like 2025, is not a leap year, so the whole calendar repeats.
- Check: by the start of 2029 only 5 odd days have gathered, and by the start of 2033 there are 10, which leaves 3; neither gives a match.
Remember · For an ordinary year, add odd days until the total is a multiple of 7, then confirm the target year is also ordinary.
Question and answer: UPSC's official GS Paper II (2024, Series A) — paper ↗ · answer key ↗. Explanation: Minimalist IAS, checked 30 Sept 2026 (how we verify). ·