If 3rd December 2000 was Sunday, what day was 3rd January 2001?

Wednesday

The correct answer is Option (3) → Wednesday

To determine the day of the week for 3rd January 2001, we calculate the number of days between the given date and the target date:

1. Count the number of days:

• Remaining days in December 2000: December has 31 days. So, from 3rd December to 31st December, there are $31 - 3 = \mathbf{28}$ days.
• Days in January 2001: We are looking for the day on 3rd January, so we add 3 days.
• Total days: $28 + 3 = \mathbf{31}$ days.

2. Find the number of odd days:

Divide the total number of days by 7 to find the remainder:

$31 \div 7 = 4 \text{ weeks and } 3 \text{ odd days.}$

3. Calculate the day:

Add the number of odd days to the starting day (Sunday):

• Sunday + 1 day = Monday
• Sunday + 2 days = Tuesday
• Sunday + 3 days = Wednesday

Final Answer: The correct option is Wednesday.