What was the day of the week on 18th January 2011 ?

Options

A. (a) Tuesday
B. (b) Monday
C. (c) Friday
D. (d) Sunday

Explanation

Total number of odd days=1600 years have 0 odd day+300 years have 1 odd day + 49 years (12 leap+37 ordinary) have 5 odd days+26 days of January have (12*2+37*1=61) odd days= 0=1=5=5=4 odd days