Explanation : 1st April, 2001 = (2000 years + period from 1.1.2001 to 1.4.2001) Odd days in 2000 years = 0 Now, calculate the odd days for the year 2001.
Jan
Feb
March
April
Total
31
28
31
1
91
91 divided by 7 gives 0 as remainder, so, odd days can be counted as 0. Total number of odd days = (0 + 0) = 0 On 1st April, 2001, it was Sunday.