अनुक्रम \(2,6,12,20,\ldots\) का (n)वाँ पद कौन-सा है?
What is the (n)th term of the sequence \(2,6,12,20,\ldots\)?
Explanation opens after your attempt
A. \(n^2+n\)
Concept
The terms are \(1\cdot2,2\cdot3,3\cdot4,\ldots\), so (a_n=n(n+1)=n-2+n). Identify the product pattern.
Why this answer is correct
The correct answer is A. \(n^2+n\). The terms are \(1\cdot2,2\cdot3,3\cdot4,\ldots\), so (a_n=n(n+1)=n-2+n). Identify the product pattern.
Exam Tip
पद \(1\cdot2,2\cdot3,3\cdot4,\ldots\) हैं, इसलिए (a_n=n(n+1)=n-2+n)। गुणन पैटर्न पहचानें।
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