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If (S_n=465), what is the value of (n) for the first (n) natural numbers?यदि (S_n=465) है तो पहली (n) प्राकृतिक संख्याओं में (n) का मान क्या है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (30)(30)
(S_{30}=\frac{30\times31}{2}=465), so (n=30). Substituting options in the formula can give a quick answer.(S_{30}=\frac{30\times31}{2}=465) इसलिए (n=30)। विकल्पों को सूत्र में रखकर जल्दी उत्तर मिल सकता है।
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