Who invented Abacus and in which year?
Also write the rule of abacus which is used now to teach students.
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It is presumed that the earliest Abacus was invented about 5000 years ago. Some historians believe that the abacus was invented by the ancient Chinese while some believe that it was invented by the Babylonians or the Egyptians. These claims are supported by historical evidence such as ancient texts and archaeological excavations.
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