# Q. The calendar for the year 2025 is same for

a) 2029

b) 2030

c) 2031

d) 2033

Correct answer: c) 2031

##### Question from UPSC Prelims 2024 CSAT Paper

**Explanation:**

## Calendar Year 2025

1. First, let’s understand what “odd days” means:

– In a non-leap year, there are 365 days, which is 52 weeks + 1 day

– This extra 1 day is called an “odd day”

– In a leap year, there are 366 days, which is 52 weeks + 2 days (2 odd days)

2. Now, let’s count the odd days from 2025 to each of the given years:

2025 to 2029:

– 2025: 1 odd day

– 2026: 1 odd day

– 2027: 1 odd day

– 2028 (leap year): 2 odd days

Total: 5 odd days

2025 to 2030:

– Same as above + 1 more day for 2029

Total: 6 odd days

2025 to 2031:

– Same as 2030 + 1 more day for 2030

Total: 0 odd days (7 odd days = 1 week, so no change in calendar)

2025 to 2033:

– Same as 2031 + 1 day each for 2031 and 2032

Total: 2 odd days

3. For the calendar to be the same, we need 0 odd days (or a multiple of 7 odd days).

4. Looking at our results, only 2031 has 0 odd days.

Therefore, the correct answer is c) 2031.