Can you fill the blank with the correct number?

6 30 870 756030 _____

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

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?

I’m tall when I’m young, and I’m short when I’m old. What am I?

A number with an interesting property:

When I divide it by 2, the remainder is 1.
When I divide it by 3, the remainder is 2.
When I divide it by 4, the remainder is 3.
When I divide it by 5, the remainder is 4.
When I divide it by 6, the remainder is 5.
When I divide it by 7, the remainder is 6.
When I divide it by 8, the remainder is 7.
When I divide it by 9, the remainder is 8.
When I divide it by 10, the remainder is 9.

It's not a small number, but it's not really big, either.
When I looked for a smaller number with this property I couldn't find one.

Can you find it?

Why do we preferably have round manhole covers and not square ones?

Can you solve the equation by finding the value of
A) Horse
B) Cowboy boot
C) Horseshoe

In the Picture?

What's a single-digit number with no value?

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

John was drowned by he was not wet. How?