What day of the week was 11th January 1801	Choose one
A) Monday B) Sunday C) Friday D) Thursday E) Tuesday
Explanation:   11th Jan 1801 = (1800 years + 11th Jan 1801)   We know that number of odd days in 400 years = 0   Hence the number of odd days in 1600 years = 0 (Since 1600 is a perfect multiple of 400)   Number of odd days in the period 1601-1800   = Number of odd days in 200 years   = 5 x 2 = 10 = 3   (As we can reduce perfect multiples of 7 from odd days without affecting anything)   11th Jan 1801 = 4 odd day   Total number of odd days = (0 + 3 + 4)= 
<gadget id="calculator">(0 + 3 + 4)</gadget>
<output>7</output>
7=0   0 odd days = Sunday   Hence 11th January 1801 is Sunday.   Answer: Option Sunday
<result>B</result>
What day of the week was 11th January 1801