यदि \(a_n=2n^2-1\) है, तो \(a_5\) क्या होगा?
If \(a_n=2n^2-1\), what is \(a_5\)?
Explanation opens after your attempt
C. (49)
Concept
Putting (n=5), (2\(5^2\)-1=49). Square first, then multiply and subtract.
Why this answer is correct
The correct answer is C. (49). Putting (n=5), (2\(5^2\)-1=49). Square first, then multiply and subtract.
Exam Tip
(n=5) रखने पर (2\(5^2\)-1=49) है। पहले वर्ग निकालें, फिर गुणा और घटाव करें।
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