If 1 January 2020 was Wednesday, then what was the day of the week on…

Using Code Method :-

\(\frac{Date+Month code+Year code+Last 2 digits of yr+Leap yrs till given yr}{7}\)

( Note: Remainder of the above sum will be the code of week day }

01 Jan 2020;

01 + 0 + 6 + 20 + 05 = 32

remainder of \(\frac{32}{7}\) = 04

Therefore, the code of 04 is Wednesday

 

Similarly,

28 Feb 2021;

28 + 04 + 06 + 21 + 05 = 64

remainder of \(\frac{64}{7}\) = 01

Therefore, the code of 01 is Sunday