अनुक्रम \(2,7,14,23,34,\ldots\) में \(a_n=n^2+n\) नहीं है। सही सामान्य पद कौन सा है?
In the sequence \(2,7,14,23,34,\ldots\), \(a_n=n^2+n\) is not correct. Which general term is correct?
Explanation opens after your attempt
C. \(a_n=n^2+2n-1\)
Concept
Substituting (n=1,2,3) in \(n^2+2n-1\) gives (2,7,14). Exam tip: test options using the first three terms.
Why this answer is correct
The correct answer is C. \(a_n=n^2+2n-1\). Substituting (n=1,2,3) in \(n^2+2n-1\) gives (2,7,14). Exam tip: test options using the first three terms.
Exam Tip
(n=1,2,3) रखने पर \(n^2+2n-1\) से (2,7,14) मिलते हैं। विकल्प जाँचते समय शुरुआती तीन पदों परखें।
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