यदि \(a_1=6\) और \(a_{n+1}=a_n+a_1+n\) है तो \(a_3\) क्या होगा?
If \(a_1=6\) and \(a_{n+1}=a_n+a_1+n\), what is \(a_3\)?
Explanation opens after your attempt
Correct Answer
C. (21)
Concept
\(a_2=6+6+1=13\) and \(a_3=13+6+2=21\). Exam tip: \(a_1\) is fixed while (n) changes.
Why this answer is correct
The correct answer is C. (21). \(a_2=6+6+1=13\) and \(a_3=13+6+2=21\). Exam tip: \(a_1\) is fixed while (n) changes.
Exam Tip
\(a_2=6+6+1=13\) और \(a_3=13+6+2=21\) है। \(a_1\) स्थिर और (n) बदलता है।
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