You are blindfolded before a table. On the table are a very large number of pennies. You are told 128 of the pennies are heads up and the rest are tails up.
How can you create two subgroups of pennies, each with the same number of heads facing up?
Fine imagination to sort out the answer. Until the cat was let out of the bag, the question intrigues one's mind. Good.
R.Kesavan.