यदि \(a_1=12\) और (a_{n+1}=a_n+(-1)^n(3n+1)) है तो \(a_4\) क्या होगा?

If \(a_1=12\) and (a_{n+1}=a_n+(-1)^n(3n+1)), what is \(a_4\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

B. (5)

Step 1

Concept

The terms are (12,8,15,5), so \(a_4=5\). Exam tip: the sign changes for even and odd (n).

Step 2

Why this answer is correct

The correct answer is B. (5). The terms are (12,8,15,5), so \(a_4=5\). Exam tip: the sign changes for even and odd (n).

Step 3

Exam Tip

पद (12,8,15,5) हैं इसलिए \(a_4=5\) है। सम और विषम (n) पर चिह्न बदलता है।

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Mathematics Answer, Explanation and Revision Hints

यदि \(a_1=12\) और (a_{n+1}=a_n+(-1)^n(3n+1)) है तो \(a_4\) क्या होगा? / If \(a_1=12\) and (a_{n+1}=a_n+(-1)^n(3n+1)), what is \(a_4\)?

Correct Answer: B. (5). Explanation: पद (12,8,15,5) हैं इसलिए \(a_4=5\) है। सम और विषम (n) पर चिह्न बदलता है। / The terms are (12,8,15,5), so \(a_4=5\). Exam tip: the sign changes for even and odd (n).

Which concept should I revise for this Mathematics MCQ?

The terms are (12,8,15,5), so \(a_4=5\). Exam tip: the sign changes for even and odd (n).

What exam hint can help solve this Mathematics question?

पद (12,8,15,5) हैं इसलिए \(a_4=5\) है। सम और विषम (n) पर चिह्न बदलता है।