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Des : 1
169 - এর বর্গমূল 169 = 13
Des : 2

আপশন টেষ্ট পদ্ধতিঃ

 খ) ১৩*১৩=১৬৯ হয় 

তাই খ. ১৩ ✅

Des : 3

The correct answer is 13, as 13^2=169.

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