Ruby in the box Puzzle

Puzzle of the Day 2099 : Ruby in the Box Riddle

Adam kept 3 identical boxes on table. One of them has a ruby in it and 2 are empty. He asks his friend Bob to pick one box randomly. Now after picking one, there are two boxes remaining on the table, one is empty. Adam then removes one empty box from the table. Finally, Bob is allowed to open either the box he picked, or the box lying on the table.

What should he do? 

ANSWER : If you spent enough time thinking about it and have a solution. Click here for the answer!

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