A chessboard has 64 squares. George places 1 grain of rice on the first square, 2 grains on the second square, 4 grains on the third square, 8 grains on the fourth square, and so on, until he has placed grains of rice on 10 squares. Once George has put rice on the 10th square, he has placed a total of (how many) grains of rice on the chess board.

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21 November, 05:50

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Pablo Kim · Answer 1

The number of grains on the Nth square Is 2^ (N-1). There are 512 grains on the 10th square alone, and 1,023 of them on all 10 squares together.