Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

Can you place six matchsticks in a manner that each of the matchsticks is in touch with the other five matchsticks?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

Which Travels Faster? Solve below famous picture riddle:

Three fair coins are tossed in the air and they land with heads up. Can you calculate the chances that when they are tossed again, two coins will again land with heads up?

Three ants are sitting at the three corners of an equilateral triangle. Each ant starts randomly picks a direction and starts to move along the edge of the triangle. What is the probability that none of the ants collide?

Find the last number in the series below:

voN luJ yaM raM ---

A container contains 100 eggs. They can be either fresh or rotten. What is sure is the fact that there is at least one fresh egg in that container.

If you are asked to pick two eggs randomly from the container, at least one of them will be rotten.

Can you calculate how many eggs in that container are fresh?

What has lots of eyes, but can’t see?

In a mathematical quiz, you are asked the following question:

Use three 9s in a mathematical expression without dividing or multiplying to form the number one.

Can you answer the question?