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முதல் 10 இயல் எண்களின் கூடுதல் என்ன?

A45
B50
C55
D60
Answer & Solution
Correct answer: C. 55
முதல் n இயல் எண்களின் கூடுதல் = n(n+1)/2 = 10 * 11 / 2 = 55.
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