Interview with Marbles

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This was asked in an interview with Coca-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 comes back, he will draw a marble from any of the two boxes 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?

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