अनुक्रम \(3,7,13,21,31,\ldots\) के लिए कौन सा सूत्र सही है?

Which formula is correct for the sequence \(3,7,13,21,31,\ldots\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

B. \(a_n=n^2+n+1\)

Step 1

Concept

\(n^2+n+1\) gives (3,7,13,21). Exam tip: match the first four terms before choosing a formula.

Step 2

Why this answer is correct

The correct answer is B. \(a_n=n^2+n+1\). \(n^2+n+1\) gives (3,7,13,21). Exam tip: match the first four terms before choosing a formula.

Step 3

Exam Tip

\(n^2+n+1\) से (3,7,13,21) मिलते हैं। सूत्र चुनते समय पहले चार पदों से मिलान करें।

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Mathematics Answer, Explanation and Revision Hints

अनुक्रम \(3,7,13,21,31,\ldots\) के लिए कौन सा सूत्र सही है? / Which formula is correct for the sequence \(3,7,13,21,31,\ldots\)?

Correct Answer: B. \(a_n=n^2+n+1\). Explanation: \(n^2+n+1\) से (3,7,13,21) मिलते हैं। सूत्र चुनते समय पहले चार पदों से मिलान करें। / \(n^2+n+1\) gives (3,7,13,21). Exam tip: match the first four terms before choosing a formula.

Which concept should I revise for this Mathematics MCQ?

\(n^2+n+1\) gives (3,7,13,21). Exam tip: match the first four terms before choosing a formula.

What exam hint can help solve this Mathematics question?

\(n^2+n+1\) से (3,7,13,21) मिलते हैं। सूत्र चुनते समय पहले चार पदों से मिलान करें।