A girl puts 1 grain of rice in the first square of an 8 by 8...

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A girl puts 1 grain of rice in the first square of an 8 by 8 chess board. In the subsequent square, she puts twice that of the previous square, and she continues until she fills all the squares. How many total grains does she need? 00 00 A girl puts 1 grain of rice in the first square of an 8 by 8 chess board. In the subsequent square, she puts twice that of the previous square, and she continues until she fills all the squares. How many total grains does she need? 00 00

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