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ആദ്യത്തെ 10 സ്വാഭാവിക സംഖ്യകളുടെ ആകെത്തുക എത്രയാണ്?

A45
B50
C55
D60
Answer & Solution
Correct answer: C. 55
ആദ്യത്തെ n സ്വാഭാവിക സംഖ്യകളുടെ ആകെത്തുക = n(n+1)/2 = 10 * 11 / 2 = 55.
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