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the servant who invented the game of chess for his persian king had the opportunity to decide on his reward he wanted to collect grains of wheat in exchange of what he did he further asked to place the grains on the squares of the chess board in such a way that each square should have double the number of frames then the square before it on so that king agreed to put one grain of wheat and the first quarter to grains on the floor for grains in the third it rains on the ford and so on​