Can you find out which number multiplied by itself will give the output as 12345678987654321?

In The 1st month of this year(the year 2013), I noticed that the date 13-1-13 (13 January 2013) is special.

This date is special as:

Date * Month = Year.

Can you figure out which year of this century has a maximum number of such dates?

What is harder to catch the faster you run?

Why do you find that most of the buildings are deprived of the 13th floor?

A girl is twice as old as her brother and half as old as her father. In 50 years, her brother will be half as old as his father. How old is the daughter now?

Rob is taller than Edwin, and Jurgen is shorter than Rob.
Of only one of the following statements, we now certainly know it is correct:

A.Edwin is taller than Jurgen
B.Jurgen is taller than Edwin
C.It cannot be determined if Jurgen or Edwin is the tallest.

A four-digit number (not beginning with 0) can be represented by ABCD. There is one number such that ABCD=A^B*C^D, where A^B means A raised to the B power. Can you find it?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

Can you name four days which start with the letter 'T'?