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প্রথম যান্ত্রিক ক্যালকুলেটর তৈরি করেন-

  1. A চার্লস ব্যবেজ
  2. B জর্জ বুল
  3. C ডরফেল্ট
  4. D লাইবনিৎস
Answer: A - চার্লস ব্যবেজ

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