यदि \(a_n=2n^2-1\) है, तो चौथा पद क्या होगा?
If \(a_n=2n^2-1\), what is the fourth term?
Explanation opens after your attempt
Correct Answer
C. (31)
Concept
\(a_4=2\times4^2-1=31\). In exams, square first, then multiply, and then subtract.
Why this answer is correct
The correct answer is C. (31). \(a_4=2\times4^2-1=31\). In exams, square first, then multiply, and then subtract.
Exam Tip
\(a_4=2\times4^2-1=31\) है। परीक्षा में वर्ग के बाद गुणा और फिर घटाना करें।
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