What is the word or phrase below?
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Why is it against the law for a man living in Delhi to be buried in Mumbai?

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?

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

What Does this text mean:

important=important

What can you serve, but never eat?

I have an eye but still cannot see.

Who am I?

This was asked in an interview with Coa-Cola.

The interviewer has given me 100 marbles(50 white and 50 black) and two empty boxes.
He then told me that he will leave the room and i need to place all the marbles in two boxes.

And When he come back, he will draw a marble from any of the two box and if the marble is white I will be hired.

Also
* No box can be empty.
* All 100 marbles must be placed in one of the two boxes.

So what should I have done?