यदि (a_n=(-1)^{n+1}n-2) है तो \(a_9+a_{10}\) का मान क्या होगा?
If (a_n=(-1)^{n+1}n-2), what will be the value of \(a_9+a_{10}\)?
Explanation opens after your attempt
A. (-19)
Concept
\(a_9=81\) and \(a_{10}=-100\), so the sum is (-19). Exam tip: track both power and sign.
Why this answer is correct
The correct answer is A. (-19). \(a_9=81\) and \(a_{10}=-100\), so the sum is (-19). Exam tip: track both power and sign.
Exam Tip
\(a_9=81\) और \(a_{10}=-100\) इसलिए योग (-19) है। घात और संकेत दोनों पर ध्यान दें।
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