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How many Pascaline calculators did Blaise Pascal build?
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Blaise Pascal
Blaise Pascal, oil painting by an anonymous artist, c. 1650; in the Musée Carnavalet–Histoire de Paris, Paris. Pascal laid the foundation for probability theory.
Blaise Pascal designed and built the Pascaline between 1642 and 1644 to assist his father with tax computations. Over the course of the following 10 years, he built 50 of these calculating machines.1