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Dr. Md Rushad Rahman
এমবিবিএস(আরপিএমসি)
,
পিজিটি(মেডিসিন)
The type of abacus most commonly used today was invented in China around the 2nd century B.C. However, abacus-like devices are first attested from ancient Mesopotamia around 2700 B.C.!
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