There are 100 coins. 80 with heads upwards and 2o with tails upwards. You are blindfolded and you can't see which coin is what. The coins are arranged randomly. You can flip each coin as many times as you want.
You have to separate the coins into two groups such that each group has equal number of tails. How will you do it?
The groups need not have equal number of coins and remember you can't see.
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