SSC CHSL Model Paper 14

Num ber of odd days in 2009
$=\frac{365}{7}=52$ weeks and 1 day
Thus, odd days in 2009, 2010, 2011, 2013
= 1 + 1 + 1 + 1 = 4
2012 is a leap year, thus 2 odd days.
Number of odd days from 2008 to 2013
= 1 + 1 + 1 + 2 + 1 = 6 days
Number of days from 2 May to 15 June = 45
Number of odd days $=\frac{45}{7}=6$ weeks 3 days
Total number of odd days = 6 + 3 = 9
Thus, 15 June 2013 = $\frac{9}{7}=1$ week and 2 days.
Therefore, it was Sunday on 15 June 2013.