यदि \(a_1=7\) और \(a_{n+1}=3a_n-2n\) है तो \(a_3\) क्या होगा?
If \(a_1=7\) and \(a_{n+1}=3a_n-2n\), what is \(a_3\)?
Explanation opens after your attempt
D. (57)
Concept
\(a_2=3\times7-2=19\) and \(a_3=3\times19-4=53\). Exam tip: when (n=2), subtract (4).
Why this answer is correct
The correct answer is D. (57). \(a_2=3\times7-2=19\) and \(a_3=3\times19-4=53\). Exam tip: when (n=2), subtract (4).
Exam Tip
\(a_2=3\times7-2=19\) और \(a_3=3\times19-4=53\) नहीं बल्कि \(a_3=53\) है। सही गणना में (n=2) पर (4) घटता है।
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