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#1089 Bangla Language & Literature General Level 9981

আলোতে যে সাতটি বর্ণ আছে তা প্রমাণ করেন কোন বিজ্ঞানী ?

  1. A আইনস্টাইন
  2. B আবদুস সালাম
  3. C জগদীশচন্দ্র বসু
  4. D নিউটন
Answer: D - নিউটন

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