अनुक्रम \(3,7,13,21,\ldots\) के लिए कौन-सा (n)वाँ पद सही है?
Which (n)th term is correct for the sequence \(3,7,13,21,\ldots\)?
Explanation opens after your attempt
A. \(a_n=n^2+n+1\)
Concept
At (n=1,2,3,4), it gives (3,7,13,21). In exams, match the rule with the starting terms.
Why this answer is correct
The correct answer is A. \(a_n=n^2+n+1\). At (n=1,2,3,4), it gives (3,7,13,21). In exams, match the rule with the starting terms.
Exam Tip
(n=1,2,3,4) पर (3,7,13,21) मिलते हैं। परीक्षा में नियम को शुरुआती पदों से मिलाएँ।
Login to save your score, XP, coins and progress.
