अनुक्रम \(2,7,14,23,34,\ldots\) में \(a_n=n^2+n\) नहीं है। सही सामान्य पद कौन सा है?

In the sequence \(2,7,14,23,34,\ldots\), \(a_n=n^2+n\) is not correct. Which general term is correct?

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Correct Answer

C. \(a_n=n^2+2n-1\)

Step 1

Concept

Substituting (n=1,2,3) in \(n^2+2n-1\) gives (2,7,14). Exam tip: test options using the first three terms.

Step 2

Why this answer is correct

The correct answer is C. \(a_n=n^2+2n-1\). Substituting (n=1,2,3) in \(n^2+2n-1\) gives (2,7,14). Exam tip: test options using the first three terms.

Step 3

Exam Tip

(n=1,2,3) रखने पर \(n^2+2n-1\) से (2,7,14) मिलते हैं। विकल्प जाँचते समय शुरुआती तीन पदों परखें।

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Mathematics Answer, Explanation and Revision Hints

अनुक्रम \(2,7,14,23,34,\ldots\) में \(a_n=n^2+n\) नहीं है। सही सामान्य पद कौन सा है? / In the sequence \(2,7,14,23,34,\ldots\), \(a_n=n^2+n\) is not correct. Which general term is correct?

Correct Answer: C. \(a_n=n^2+2n-1\). Explanation: (n=1,2,3) रखने पर \(n^2+2n-1\) से (2,7,14) मिलते हैं। विकल्प जाँचते समय शुरुआती तीन पदों परखें। / Substituting (n=1,2,3) in \(n^2+2n-1\) gives (2,7,14). Exam tip: test options using the first three terms.

Which concept should I revise for this Mathematics MCQ?

Substituting (n=1,2,3) in \(n^2+2n-1\) gives (2,7,14). Exam tip: test options using the first three terms.

What exam hint can help solve this Mathematics question?

(n=1,2,3) रखने पर \(n^2+2n-1\) से (2,7,14) मिलते हैं। विकल्प जाँचते समय शुरुआती तीन पदों परखें।