Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

You stand in front of two doors. A guard stands next to each door. You know the following things: one path leads to paradise, the other leads to death. You cannot distinguish between the two doors. You also know that one of the two guards always tells the truth and the other always lies. You have permission to ask one guard one question to discover which door leads to paradise. What one question would you ask to guarantee you enter the door to paradise?

Which is the smallest number that you can write using all the vowels exactly once?

Find the Odd One Out?
84129
32418
47632
36119
67626
72927

There were five men at church, and it started raining while they were outside. The four that ran still got wet, but the one that was still stayed completely dry. Why did he stay dry?

Can you find out which options fits best with the missing column?

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

What makes this number unique: 8,549,176,320?