अनुक्रम \(1,3,6,10,\ldots\) में (21) कौन-सा पद है?

In the sequence \(1,3,6,10,\ldots\), which term is (21)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

B. छठा पदsixth term

Step 1

Concept

Its rule is (a_n=\frac{n(n+1)}{2}), and \(a_6=21\). In exams, recognize the triangular-number pattern.

Step 2

Why this answer is correct

The correct answer is B. छठा पद / sixth term. Its rule is (a_n=\frac{n(n+1)}{2}), and \(a_6=21\). In exams, recognize the triangular-number pattern.

Step 3

Exam Tip

इसका नियम (a_n=\frac{n(n+1)}{2}) है और \(a_6=21\) है। परीक्षा में त्रिभुज संख्या का पैटर्न पहचानें।

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Mathematics Answer, Explanation and Revision Hints

अनुक्रम \(1,3,6,10,\ldots\) में (21) कौन-सा पद है? / In the sequence \(1,3,6,10,\ldots\), which term is (21)?

Correct Answer: B. छठा पद / sixth term. Explanation: इसका नियम (a_n=\frac{n(n+1)}{2}) है और \(a_6=21\) है। परीक्षा में त्रिभुज संख्या का पैटर्न पहचानें। / Its rule is (a_n=\frac{n(n+1)}{2}), and \(a_6=21\). In exams, recognize the triangular-number pattern.

Which concept should I revise for this Mathematics MCQ?

Its rule is (a_n=\frac{n(n+1)}{2}), and \(a_6=21\). In exams, recognize the triangular-number pattern.

What exam hint can help solve this Mathematics question?

इसका नियम (a_n=\frac{n(n+1)}{2}) है और \(a_6=21\) है। परीक्षा में त्रिभुज संख्या का पैटर्न पहचानें।