यदि \(a_1=2\), \(a_2=5\) और \(a_n=2a_{n-1}+a_{n-2}+2n\) है तो \(a_5\) क्या होगा?

If \(a_1=2\), \(a_2=5\), and \(a_n=2a_{n-1}+a_{n-2}+2n\), what is \(a_5\)?

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

D. (126)

Step 1

Concept

The terms are (2,5,18,49,126), so \(a_5=126\). Exam tip: add the current (2n) at each step.

Step 2

Why this answer is correct

The correct answer is D. (126). The terms are (2,5,18,49,126), so \(a_5=126\). Exam tip: add the current (2n) at each step.

Step 3

Exam Tip

पद (2,5,18,49,126) हैं इसलिए \(a_5=126\) है। वर्तमान (2n) को हर चरण में जोड़ें।

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Mathematics Answer, Explanation and Revision Hints

यदि \(a_1=2\), \(a_2=5\) और \(a_n=2a_{n-1}+a_{n-2}+2n\) है तो \(a_5\) क्या होगा? / If \(a_1=2\), \(a_2=5\), and \(a_n=2a_{n-1}+a_{n-2}+2n\), what is \(a_5\)?

Correct Answer: D. (126). Explanation: पद (2,5,18,49,126) हैं इसलिए \(a_5=126\) है। वर्तमान (2n) को हर चरण में जोड़ें। / The terms are (2,5,18,49,126), so \(a_5=126\). Exam tip: add the current (2n) at each step.

Which concept should I revise for this Mathematics MCQ?

The terms are (2,5,18,49,126), so \(a_5=126\). Exam tip: add the current (2n) at each step.

What exam hint can help solve this Mathematics question?

पद (2,5,18,49,126) हैं इसलिए \(a_5=126\) है। वर्तमान (2n) को हर चरण में जोड़ें।