What is next number in the pattern below:

131 517 192 123 ?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

There are 3 apples in the basket and you take away 2. How many apples do you have now?

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

I have no life, but I can die. What am I?

I have Rs.50 and I spend it in the way as below.

Count the number of triangles in the picture below:

In the Wild West, you are challenged into a death match by two bounty hunters nicknamed Golden Revolver (GR) and Killer Boots (KB). You accept the challenge. None of you want to waste any of the bullet and so a certain rules are laid down:

1) All of you will shoot in a given order till the last man standing.
2) Each of you shoots only once upon his turn.
3) If any one of you is injured, the other two will finish him off with an iron rod.
4) The worst shooter of all (which is you) shoots first and the best one shoots at the last.

Now, how will you plan things if you know that you hit every third shot of yours, KB hits every second shot and GR hits every shot ?

A person was killed at a house party. When the police arrive, there are six people present in the house who are the friends of the victim. The name of the friends is Rohit, Aman, Nick, Gagan, and Randy.

Near the dead body, they find a few numbers written with blood by the victim on the floor. The numbers are 8, 5, 4, and 11.

The police arrests one of the friends for the murder. Whom did they arrest and why?

You can see three almost identical images below. Can you spot the odd one out from them?