What is next number in the pattern below:

131 517 192 123 ?

I have teeth but i don't bite. Who Am I ?

The more you take me, the more you leave me behind.
Who Am I?

They are three errirs in this question. Can you find them?

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

Who always enjoys poor health?

How is a fly different from a mosquito?

A pack of cards has 40 cards. You are blindfolded. Out of 40, 25 cards are facing down while 15 are facing up. You have been asked to divide this pack of cards into two decks - so that each deck contains an equal number of face-up cards. Remember, you are blindfolded.

How will you do it?

What is the unique property of the following words ?
* Revive
* Banana
* Grammar
* Voodoo
* Assess
* Potato
* Dresser
* Uneven

You need to arrange three 7 and mathematical symbols to form number 1?