निम्न मे से प्रथम गणना यंत� – McqOptions

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1.	निम्न मे से प्रथम गणना यंत्र कौनसा है?
A.	कैलकुलेटर
B.	अबैकस
C.	घडी
D.	डिफरेंस इंजन
Answer» C. घडी

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