Who invented Napier's bone ?
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John Napier
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William Napier
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Napier Bone
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Charles Babbage
A
Correct answer
Explanation
John Napier, a Scottish mathematician, invented Napier's bones in 1617 as a calculating tool for multiplication and division. It was an early form of a mechanical calculator using numbered rods. William Napier and Charles Babbage were not the inventors of this device.