Solution:Short Trick:
(Code:- 100 = 5, 200 = 3, 300 = 1, 400 = 0)
Let’s find the day on 31 Dec 1991.
So, take the year 1991 = 1600 + 300 + 91 = 0 + 1 + 91 + 22
(No. Of leap year)=114
On dividing 114 by 7, remainder is 2 (i.e. Tuesday).
Now, let’s starts with January1992,
So, 3 + 1 + 3 + 2 + 3 + 10 = 22
Divide 22 by 7, remainder is 1.
Now, Tuesday + 1 = Wednesday