अनुक्रम \(2,6,12,20,\ldots\) का सामान्य पद (a_n=n(n+1)) है। कौन सा पद (72) के बराबर है?
The sequence \(2,6,12,20,\ldots\) has general term (a_n=n(n+1)). Which term is equal to (72)?
Explanation opens after your attempt
B. (8)वाँ(8)th
Concept
For (n(n+1)=72), \(8\times9=72\). Exam tip: check nearby factor pairs quickly.
Why this answer is correct
The correct answer is B. (8)वाँ / (8)th. For (n(n+1)=72), \(8\times9=72\). Exam tip: check nearby factor pairs quickly.
Exam Tip
(n(n+1)=72) में \(8\times9=72\) मिलता है। ऐसी स्थिति में आस-पास के गुणनखंड जल्दी जाँचें।
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