On 8^th Dec, 2007 Saturday falls. What day of the week was it on 8^th Dec, 2006?

Explanation:-

The year 2006 is an ordinary year. So, it has 1 odd day.
So, the day on 8^th Dec, 2007 will be 1 day beyond the day on 8^th Dec, 2006.
But, 8^th Dec, 2007 is Saturday.
∴ 8^th Dec, 2006 is Friday.