What is next number in the pattern below:

131 517 192 123 ?

What is the fastest way to double your money?

There is a square piece of paper with a hole that is denoted by the circle on the top right side in the given picture. You have to cut the paper in a manner that it forms two and only two separate pieces of paper and then rearrange the pieces in a manner that the holes come in the centre of the paper.

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

If two's company, and three's a crowd, then whats four and five ?

13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

There was a blind man. He had four socks in his drawer either black or white. He opened it and took out two socks. Now the probability that it was a pair of white socks is 1/2.

Can you find out the probability that he had taken out a pair of black socks ?

There is something which you can be arrested for attempting but not for successfully completing.

Which word does the below Plexor means ?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?