If 15 August 2006 is a Tuesday, then what will the day of the week on 7 September 2017?

15 August 2006 was a Tuesday
7 September 2017 = ?

Total number of Odd Days in Months between 15 August and 7 September = 16 + 7 = 23 $$\div$$ 7 = 3 and 2 Remainder 2 = 2

Total Odd Days in years between 2006 and 2017 = 2007  + 2008 + 2009 + 2010 + 2011 + 2012 + 2013 + 2014 + 2015 + 2016 + 2017 + 3 (Leap year) =  14 ​$$\div$$ 7 = 2 and 0 remainder = 0

(Since In a normal year, there is only one odd days)

Total Odd Days = 2 + 0 = 2

Therefore, Tuesday + 2 = Thursday

Thus the correct option is (a) Thursday