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Q: Arithmometer was invented by
  • A. Evanglista Torricelli
  • B. Charles Xavier Thomas
  • C. Edward Teller
  • D. Gustav Tauschek
Correct Answer: Option B - The arithmometer was invented in 1820 by Charles Xavier Thomas de Colmar. It was the first digital mechanical calculator.
B. The arithmometer was invented in 1820 by Charles Xavier Thomas de Colmar. It was the first digital mechanical calculator.

Explanations:

The arithmometer was invented in 1820 by Charles Xavier Thomas de Colmar. It was the first digital mechanical calculator.