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If the sum of the first (n) natural numbers is (861), what is the value of (n)?यदि पहली (n) प्राकृतिक संख्याओं का योग (861) है तो (n) का मान क्या है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (41)(41)
(S_{41}=\frac{41\times42}{2}=861), so (n=41). In such questions, check the options in the formula.(S_{41}=\frac{41\times42}{2}=861) इसलिए (n=41)। ऐसे प्रश्नों में विकल्पों को सूत्र में रखकर जांचें।
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