Explanation : 28th May, 2007 = (2000 years + 6 years + period from 1.1.2007 to 28.5.2007) Odd days in 2000 years = 0 Odd days till 2006 = (5 ordinary years + 1 leap year) =(5 × 1 + 1 × 2) = 7 odd days
Jan
Feb
March
April
May
Total
31
28
31
30
28
148
148 days = (21 weeks + 1 day) ⇒ 1 odd day Total number of odd days = (2000 years + 6 years + period from 1.1.2007 to 28.5.2007) = (0 + 7 + 1) = 8 odd days, i.e., again 1 odd day. Hence, Monday is the answer.