यदि \(a_1=3\) और \(a_{n+1}=2a_n+2n+1\) है तो \(a_3\) क्या होगा?
If \(a_1=3\) and \(a_{n+1}=2a_n+2n+1\), what is \(a_3\)?
Explanation opens after your attempt
C. (23)
Concept
\(a_2=2\times3+3=9\) and \(a_3=2\times9+5=23\). Exam tip: the value of (2n+1) changes each time.
Why this answer is correct
The correct answer is C. (23). \(a_2=2\times3+3=9\) and \(a_3=2\times9+5=23\). Exam tip: the value of (2n+1) changes each time.
Exam Tip
\(a_2=2\times3+3=9\) और \(a_3=2\times9+5=23\) है। (2n+1) का मान हर बार बदलता है।
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