यदि \(a_1=4\) और (a_{n+1}=2a_n+(-1)^n(2n+1)) है तो \(a_4\) क्या होगा?

If \(a_1=4\) and (a_{n+1}=2a_n+(-1)^n(2n+1)), what is \(a_4\)?

Author: Muft Shiksha Editorial Team Published: Updated:
Explanation opens after your attempt
Correct Answer

A. (23)

Step 1

Concept

The terms are (4,5,15,23), so \(a_4=23\). Exam tip: double first and then add the signed part.

Step 2

Why this answer is correct

The correct answer is A. (23). The terms are (4,5,15,23), so \(a_4=23\). Exam tip: double first and then add the signed part.

Step 3

Exam Tip

पद (4,5,15,23) हैं इसलिए \(a_4=23\) है। दोगुना करने के बाद चिह्न वाला भाग जोड़ें।

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Mathematics Answer, Explanation and Revision Hints

यदि \(a_1=4\) और (a_{n+1}=2a_n+(-1)^n(2n+1)) है तो \(a_4\) क्या होगा? / If \(a_1=4\) and (a_{n+1}=2a_n+(-1)^n(2n+1)), what is \(a_4\)?

Correct Answer: A. (23). Explanation: पद (4,5,15,23) हैं इसलिए \(a_4=23\) है। दोगुना करने के बाद चिह्न वाला भाग जोड़ें। / The terms are (4,5,15,23), so \(a_4=23\). Exam tip: double first and then add the signed part.

Which concept should I revise for this Mathematics MCQ?

The terms are (4,5,15,23), so \(a_4=23\). Exam tip: double first and then add the signed part.

What exam hint can help solve this Mathematics question?

पद (4,5,15,23) हैं इसलिए \(a_4=23\) है। दोगुना करने के बाद चिह्न वाला भाग जोड़ें।