what is abacus???? Can u explain me?????? chlo batao batao???
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An abacus is a simple 'counting frame' that was used by many great ancient civilizations (there is recorded use by Mesopotamians, ancient Egyptians, Persians, Greeks, Romans, the Chinese Tang Dynasty, Buddhist scholars, etc.). Monikered as 'The First Calculator,' this nifty device allowed ancient scholars to perform large digit numerical operations with ease, long before the invention of the written numerical system.
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