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একটি ত্রিভুজের একটি কোণের মান 90 ; অন্য কোণ দুটির অনুপাত 2 : 3 হলে ছোট কোণটির পূরক কোণ -

  1. A 126
  2. B 144
  3. C 36
  4. D 54
Answer: D - 54

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