Discussion
Given that 15th March, 2025 is a Saturday, which date of March, 2050 among the following is a Sunday ?
Answer: A
The Sunday is 20 March 2050.
From 15 March 2025 to 15 March 2050 is 25 years. Each ordinary year moves the weekday on by 1, and each 29 February in between adds 1 more. The leap days fall in 2028, 2032, 2036, 2040, 2044 and 2048, which is 6.
\[ \begin{aligned} \text{shift} &= 25 + 6 = 31 \\ 31 &\equiv 3 \pmod 7 \end{aligned} \]
So 15 March 2050 falls 3 days after Saturday, on a Tuesday. The following Sunday is 15 + 5 = 20 March.
Forgetting the leap days gives a shift of 25, which leaves 4, making 15 March a Wednesday and pointing wrongly to the 19th.
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