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మొదటి 10 సహజ సంఖ్యల మొత్తం ఎంత?

A45
B50
C55
D60
Answer & Solution
Correct answer: C. 55
మొదటి n సహజ సంఖ్యల మొత్తం = n(n+1)/2 = 10 * 11 / 2 = 55.
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