Puzzle : There are 50 1-cent coins on the table. Initially all coins are tails up. Close your eyes, and I will turn over 10 random coins. The task is to divide all the coins into two groups blindly, so that the groups have an equal number of heads up.
Solution : We r sure that there r 10 heads in the group ..
So separate 10 random coins to form a group.. and remaining 40 will be in another group.. So if there are x heads in 10grp there will b 10-x heads in 40grp..
ie, the no of tails in 10grp is equal to the no of heads in 40grp..
So if u flip all the coins in 10grp all the tails will become heads and finally now both groups have same number of heads..
http://geniusbeauty.com/mental-beauty/brain-game-how-to-become-a-psychic/
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