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)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

B. (8)वाँ(8)th

Step 1

Concept

For (n(n+1)=72), \(8\times9=72\). Exam tip: check nearby factor pairs quickly.

Step 2

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.

Step 3

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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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)?

Correct Answer: B. (8)वाँ / (8)th. Explanation: (n(n+1)=72) में \(8\times9=72\) मिलता है। ऐसी स्थिति में आस-पास के गुणनखंड जल्दी जाँचें। / For (n(n+1)=72), \(8\times9=72\). Exam tip: check nearby factor pairs quickly.

Which concept should I revise for this Mathematics MCQ?

For (n(n+1)=72), \(8\times9=72\). Exam tip: check nearby factor pairs quickly.

What exam hint can help solve this Mathematics question?

(n(n+1)=72) में \(8\times9=72\) मिलता है। ऐसी स्थिति में आस-पास के गुणनखंड जल्दी जाँचें।