How many letters are in the alphabet?

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

Rearrange the letters in "new door" to make one word.

Using Only Five 5's and any mathematical operator make sum as 37

Can you guess the name of the month by looking the below rebus ?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

In the following picture, E is going to slide the object down and as per the terrain and the physics, the round object is going to travel all the way till the end. Now, can you analyze who all people will die when it happens?

Consider all the numbers between 1 and 1 million. Among all these numbers, there is something very special about the number 8 and the number 2202. What is it?

What has no start, end, or centre?