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If (S_n-S_{n-7}=1001), what will be the value of (n)?यदि (S_n-S_{n-7}=1001) है तो (n) का मान क्या होगा?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (142)(142)
The difference is ((n-6)+(n-5)+\cdots+n=7n-21), and (7n-21=1001) gives (n=146). Form the sum of the last seven terms.अंतर ((n-6)+(n-5)+\cdots+n=7n-21) है और (7n-21=1001) से (n=146) मिलता है। अंतिम सात पदों का योग बनाएं।
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