Explanation : From August 15, 2012, till August 15, 2013, there
is one extra day. In the rest of 16 days of August, there
are 2 odd days. In September, there are 2 odd days, and
in October, 3 odd days. In first 15 days of November,
there will be 1 odd day. Thus, the total number of odd
days is 1 + 2 + 2 + 3 + 1 = 9; it means 2 extra (odd) days.
Hence, November 15, 2013 was Friday.