What was the day of the week on 10th October 2021?
Sunday
Given date: 10 October 2021
| Year | Odd days |
| 100 | 5 odd days |
| 200 | 3 odd days |
| 300 | 1 odd day |
| 400 | 0 odd days |
Now,
up to 2020 → 2000 + 20
| Leap year | 2 odd days |
| Common year | 1 odd day |
⇒ 0 + 25 = 25 odd days
And, up to 10 October
⇒ 31 (January) + 28 (February) + 31 (March) + 30 (April) + 31 (May) + 30 (June) + 31 (July) + 31 (August) + 30 (September) + 10 (October) = 283 odd days
Total odd days → 25 + 283 = 308 days = 308/7 = 44 weeks and 0 odd days
→ 0 indicates Sunday.
Therefore, 10 October 2021 was a Sunday.
Thus, the correct answer is "Option 2".
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