यदि \(a_1=2\) और \(a_{n+1}=a_n+n^2+2n+1\) है तो \(a_4\) क्या होगा?

If \(a_1=2\) and \(a_{n+1}=a_n+n^2+2n+1\), what is \(a_4\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

B. (31)

Step 1

Concept

The terms are (2,6,15,31), so \(a_4=31\). Exam tip: recognize \(n^2+2n+1\) as ((n+1)2).

Step 2

Why this answer is correct

The correct answer is B. (31). The terms are (2,6,15,31), so \(a_4=31\). Exam tip: recognize \(n^2+2n+1\) as ((n+1)2).

Step 3

Exam Tip

पद (2,6,15,31) हैं इसलिए \(a_4=31\) है। \(n^2+2n+1\) को ((n+1)2) की तरह पहचानें।

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Mathematics Answer, Explanation and Revision Hints

यदि \(a_1=2\) और \(a_{n+1}=a_n+n^2+2n+1\) है तो \(a_4\) क्या होगा? / If \(a_1=2\) and \(a_{n+1}=a_n+n^2+2n+1\), what is \(a_4\)?

Correct Answer: B. (31). Explanation: पद (2,6,15,31) हैं इसलिए \(a_4=31\) है। \(n^2+2n+1\) को ((n+1)2) की तरह पहचानें। / The terms are (2,6,15,31), so \(a_4=31\). Exam tip: recognize \(n^2+2n+1\) as ((n+1)2).

Which concept should I revise for this Mathematics MCQ?

The terms are (2,6,15,31), so \(a_4=31\). Exam tip: recognize \(n^2+2n+1\) as ((n+1)2).

What exam hint can help solve this Mathematics question?

पद (2,6,15,31) हैं इसलिए \(a_4=31\) है। \(n^2+2n+1\) को ((n+1)2) की तरह पहचानें।