Wednesday, May 22nd

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Coins lying on table

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An even number of coins are placed on a table. You also are aware that there are as many coins with Head up as with Tail up. Now, you are required to divide the coins into two equal piles such that number of coins with Heads up and Tails up in either piles is the same. The catch is you are blind folded and you cannot determine the sides (for sure) if you are blinded.

Another way of asking the same puzzle is 

There are 50 1 Re coins on the table. Initially all coins are tails up.
I blindfold you now and then I turn over 10 random coins. The task now is to divide all the coins into two groups blindly, so that the groups have an equal number of heads up.
P.S. This puzzle is from a Microsoft Interview.

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