यदि \(a_1=2\) और (a_{n+1}=a_n+\frac{n(n+1)}{2}+1) है तो \(a_5\) क्या होगा?

If \(a_1=2\) and (a_{n+1}=a_n+\frac{n(n+1)}{2}+1), what is \(a_5\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

C. (28)

Step 1

Concept

The terms are (2,4,8,15,26), so \(a_5=26\). Exam tip: add the increasing increments carefully.

Step 2

Why this answer is correct

The correct answer is C. (28). The terms are (2,4,8,15,26), so \(a_5=26\). Exam tip: add the increasing increments carefully.

Step 3

Exam Tip

पद (2,4,8,15,26) नहीं बल्कि \(a_5=26\) है। (2,4,7,11) जैसे बढ़ते जोड़ ध्यान से जोड़ें।

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Mathematics Answer, Explanation and Revision Hints

यदि \(a_1=2\) और (a_{n+1}=a_n+\frac{n(n+1)}{2}+1) है तो \(a_5\) क्या होगा? / If \(a_1=2\) and (a_{n+1}=a_n+\frac{n(n+1)}{2}+1), what is \(a_5\)?

Correct Answer: C. (28). Explanation: पद (2,4,8,15,26) नहीं बल्कि \(a_5=26\) है। (2,4,7,11) जैसे बढ़ते जोड़ ध्यान से जोड़ें। / The terms are (2,4,8,15,26), so \(a_5=26\). Exam tip: add the increasing increments carefully.

Which concept should I revise for this Mathematics MCQ?

The terms are (2,4,8,15,26), so \(a_5=26\). Exam tip: add the increasing increments carefully.

What exam hint can help solve this Mathematics question?

पद (2,4,8,15,26) नहीं बल्कि \(a_5=26\) है। (2,4,7,11) जैसे बढ़ते जोड़ ध्यान से जोड़ें।