यदि \(a_1=5\) और (a_{n+1}=a_n+(-1)^{n+1}n) है तो \(a_4\) क्या होगा?

If \(a_1=5\) and (a_{n+1}=a_n+(-1)^{n+1}n), what is \(a_4\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

D. (7)

Step 1

Concept

The terms are (5,6,4,7), so \(a_4=7\). Exam tip: check the sign of ((-1)^{n+1}) at each step.

Step 2

Why this answer is correct

The correct answer is D. (7). The terms are (5,6,4,7), so \(a_4=7\). Exam tip: check the sign of ((-1)^{n+1}) at each step.

Step 3

Exam Tip

पद (5,6,4,7) हैं इसलिए \(a_4=7\) है। ((-1)^{n+1}) के चिह्न को हर चरण में जाँचें।

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Mathematics Answer, Explanation and Revision Hints

यदि \(a_1=5\) और (a_{n+1}=a_n+(-1)^{n+1}n) है तो \(a_4\) क्या होगा? / If \(a_1=5\) and (a_{n+1}=a_n+(-1)^{n+1}n), what is \(a_4\)?

Correct Answer: D. (7). Explanation: पद (5,6,4,7) हैं इसलिए \(a_4=7\) है। ((-1)^{n+1}) के चिह्न को हर चरण में जाँचें। / The terms are (5,6,4,7), so \(a_4=7\). Exam tip: check the sign of ((-1)^{n+1}) at each step.

Which concept should I revise for this Mathematics MCQ?

The terms are (5,6,4,7), so \(a_4=7\). Exam tip: check the sign of ((-1)^{n+1}) at each step.

What exam hint can help solve this Mathematics question?

पद (5,6,4,7) हैं इसलिए \(a_4=7\) है। ((-1)^{n+1}) के चिह्न को हर चरण में जाँचें।