An inventor of the first mechanical calculator

A. Charles Babbage - चार्ल्स बैबेज

B. Blaise Pascal - ब्लेस पास्कल

C. Rene Descartes - रेने डेस्कर्टेस

D. Herman Hollerith - हरमन होलेरिथ

Correct Answer

B. Blaise Pascal - ब्लेस पास्कल

Explanation :

 Blaise Pascal invented a mechanical calculator with a sophisticated carry mechanism in 1642. After three years of effort and 50 prototypes he introduced his calculator to the public.