अनुक्रम \(1,3,6,10,\ldots\) में (21) कौन-सा पद है?
In the sequence \(1,3,6,10,\ldots\), which term is (21)?
Explanation opens after your attempt
B. छठा पदsixth term
Concept
Its rule is (a_n=\frac{n(n+1)}{2}), and \(a_6=21\). In exams, recognize the triangular-number pattern.
Why this answer is correct
The correct answer is B. छठा पद / sixth term. Its rule is (a_n=\frac{n(n+1)}{2}), and \(a_6=21\). In exams, recognize the triangular-number pattern.
Exam Tip
इसका नियम (a_n=\frac{n(n+1)}{2}) है और \(a_6=21\) है। परीक्षा में त्रिभुज संख्या का पैटर्न पहचानें।
Login to save your score, XP, coins and progress.
