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If the sum of the first (n) natural numbers is (45), what is (n)?यदि पहली (n) प्राकृतिक संख्याओं का योग (45) है तो (n) क्या है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (9)(9)
(S_9=\frac{9\times10}{2}=45), so (n=9). In such questions, checking options in the formula is fast.(S_9=\frac{9\times10}{2}=45) इसलिए (n=9)। ऐसे प्रश्नों में विकल्पों को सूत्र में रखकर जांचना तेज होता है।
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