अनुक्रम \(3,7,13,21,31,\ldots\) के लिए कौन सा सूत्र सही है?
Which formula is correct for the sequence \(3,7,13,21,31,\ldots\)?
Explanation opens after your attempt
B. \(a_n=n^2+n+1\)
Concept
\(n^2+n+1\) gives (3,7,13,21). Exam tip: match the first four terms before choosing a formula.
Why this answer is correct
The correct answer is B. \(a_n=n^2+n+1\). \(n^2+n+1\) gives (3,7,13,21). Exam tip: match the first four terms before choosing a formula.
Exam Tip
\(n^2+n+1\) से (3,7,13,21) मिलते हैं। सूत्र चुनते समय पहले चार पदों से मिलान करें।
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