Qus: The earliest calculating devices are

Qusसबसे पुराना गणना करने वाले उपकरण हैं

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A. अबेकस
B. घड़ी
C. कैलकुलेटर
D. इनमे से कोई भी नहीं

Solution

A. Abacus

Explanation

Abacus, plural abaci or abacuses, calculating device, probably of Babylonian origin, that was long important in commerce. It is the ancestor of the modern calculating machine and computer.