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#2721 Bangla Language & Literature General Level 17055

<p>যদি <img src="http://sothik.com/files/model-test/du-20216/untitled%20folder/image003.png" alt="" />এবং <img src="http://sothik.com/files/model-test/du-20216/untitled%20folder/image005.png" alt="" />তবে m এর মান কত হলে ভেক্টরদ্বয় পরস্পরের উপর লম্ব হবে ?</p>

  1. A <p>120</p>
  2. B <p>12</p>
  3. C <p>20</p>
  4. D <p>22</p>
Answer: D - <p>22</p>

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