The host of a game show, offers the guest a choice of three doors. Behind one is a expensive car, but behind the other two are goats.
After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).

Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.

You cannot hear the goats from behind the doors, or in any way know which door has the prize.

Should you stay, or switch, or doesn't it matter?

Can you count the number of triangles in the given figure?

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?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

You need to remove two matchsticks to make the below equation true. Can you do it ?

Solve the below puzzle by replacing the question mark with the correct number.

3 6 12

4 8 16

5 10 ?

Find the smallest sentence with all the English alphabet.

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?