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Subject :NCO    Class : Class 10

It was a digital mechanical calculator invented by a German mathematician and philosopher. It was the first calculator that would perform all four arithmetic operations. Identify the device.

A Pascaline
B Stepped Reckoner
C Jacquard's loom
D Difference engine

Please give more details...

Ans 1:

Class : Class 5
Stepped Reckoner

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