यदि \(a_1=12\) और (a_{n+1}=a_n+(-1)^n(3n+1)) है तो \(a_5\) क्या होगा?

If \(a_1=12\) and (a_{n+1}=a_n+(-1)^n(3n+1)), what is \(a_5\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

C. (8)

Step 1

Concept

The terms are (12,8,15,5,18), so \(a_5=18\). Exam tip: track the alternating sign carefully.

Step 2

Why this answer is correct

The correct answer is C. (8). The terms are (12,8,15,5,18), so \(a_5=18\). Exam tip: track the alternating sign carefully.

Step 3

Exam Tip

पद (12,8,15,5,18) हैं इसलिए \(a_5=18\) है। सही विकल्पों में (18) होना चाहिए।

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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 \(a_5\) क्या होगा? / If \(a_1=12\) and (a_{n+1}=a_n+(-1)^n(3n+1)), what is \(a_5\)?

Correct Answer: C. (8). Explanation: पद (12,8,15,5,18) हैं इसलिए \(a_5=18\) है। सही विकल्पों में (18) होना चाहिए। / The terms are (12,8,15,5,18), so \(a_5=18\). Exam tip: track the alternating sign carefully.

Which concept should I revise for this Mathematics MCQ?

The terms are (12,8,15,5,18), so \(a_5=18\). Exam tip: track the alternating sign carefully.

What exam hint can help solve this Mathematics question?

पद (12,8,15,5,18) हैं इसलिए \(a_5=18\) है। सही विकल्पों में (18) होना चाहिए।