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প্রথম 10টি স্বাভাবিক সংখ্যার সমষ্টি কত?

A45
B50
C55
D60
Answer & Solution
Correct answer: C. 55
প্রথম n-টি স্বাভাবিক সংখ্যার সমষ্টি = n(n+1)/2 = 10 * 11 / 2 = 55।
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