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First mechanical calculator was built in 1642 by

  • A.Stephen hales
  • B.Blaise Pascal
  • C.Gerardus mercator
  • D.Thomas newcomen

Answer: B

Blaise Pascal built it.

He made the Pascaline in 1642 at nineteen to help his father, a tax official, with his accounts. It added and subtracted by geared wheels with automatic carry, and about twenty were made.

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