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1. স্বাভাবিক সংখ্যার সেট N গঠিত হয় -

  • A. { 1, 2, 3, ....}
  • B. { 1, 2, 3, ....}
  • C. { 1, 2, 3, ....}
  • D. { 1, 2, 3, ....}

Answer: Option A

Explanation:

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