একটি ধনাত্মক সংখ্যার দ্বিগুণের বর্গের সাথে ১৫ যোগ করলে যোগফল ৪১৫ হয়। সংখ্যাটি কত?
A. ১১
B. ১৩
C. ১০
D. ১৫
সঠিক উত্তরঃ
C.
১০
Explanation:
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