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If (S_n=120) and (S_n) is the sum of the first (n) natural numbers, what is (n)?यदि (S_n=120) और (S_n) पहली (n) प्राकृतिक संख्याओं का योग है तो (n) क्या होगा?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (15)(15)
(S_{15}=120) because (\frac{15\times16}{2}=120). In such questions, verify the answer back in the formula.(S_{15}=120) क्योंकि (\frac{15\times16}{2}=120)। ऐसे प्रश्नों में उत्तर को वापस सूत्र में जांचें।
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