alleryप्रथम 10 प्राकृतिक संख्याओं का योग क्या है?
A45
B50
C55
D60
Answer & Solution
Correct answer: C. 55
प्रथम n प्राकृतिक संख्याओं का योग = n(n+1)/2 = 10 x 11 / 2 = 55।
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