यदि \(a_n=5n^2-4n\) है, तो \(a_4\) का मान क्या होगा?
If \(a_n=5n^2-4n\), what is the value of \(a_4\)?
Explanation opens after your attempt
A. (64)
Concept
\(a_4=5\times16-16=64\). In exams, subtract the linear part from the square-based part.
Why this answer is correct
The correct answer is A. (64). \(a_4=5\times16-16=64\). In exams, subtract the linear part from the square-based part.
Exam Tip
\(a_4=5\times16-16=64\) है। परीक्षा में वर्ग वाले भाग से रैखिक भाग घटाएँ।
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