Rohan's birthday falls on the day just after 4th Monday of the January 20XX. The day on which Rohan celebrates his birthday is ________ .
12 men can do a piece of work in 30 days. How many more men will be required to do it in 20 days?
One of the factors of a2 - 2ab - c2 + b2 is ________.
A(a - b + c)
B(a + b + c)
C(a + b - c)
DNone of these