Question
Download Solution PDFWhat day was it on 25 June 1981 AD ?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven date: 25 June, 1981.
| Year | Odd Days |
| 100 | 5 odd days |
| 200 | 3 odd days |
| 300 | 1 odd days |
| 400 | 0 odd days |
Now,
Till 1981 → 1600 + 300 + 80
In 1600 years 0 odd days
In the next 300 years 1 odd days
| Leap Year | 2 Odd days |
| Ordinary Year |
1 Odd days |
In the next 80 years, there are 20 leap years and 60 ordinary years
So, number of odd days = 20 × 2 + 60 = 100
Now, total odd days ⇒ 1 + 100 = 101 odd days.
And, till 25 June
⇒ 31(Jan) + 28(Feb) + 31(March) + 30(April) + 31(May) + 25(June) = 176
Total odd days → 101 + 176 = 277 days = 277/7 = 39 weeks and 4 odd days.
| No. of odd days | Day |
| 0 | Sunday |
| 1 | Monday |
| 2 | Tuesday |
| 3 | Wednesday |
| 4 | Thursday |
| 5 | Friday |
| 6 | Saturday |
→ 4 represents Thursday.
So, 25 June 1981 was Thursday.
Hence, the correct answer is "Thursday".
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