यदि \(a_1=30\) और (a_{n+1}=a_n-(2n+1)) है तो \(a_4\) क्या होगा?

If \(a_1=30\) and (a_{n+1}=a_n-(2n+1)), what is \(a_4\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

A. (15)

Step 1

Concept

The terms are (30,27,22,15), so \(a_4=15\). Exam tip: calculate (2n+1) correctly before subtracting.

Step 2

Why this answer is correct

The correct answer is A. (15). The terms are (30,27,22,15), so \(a_4=15\). Exam tip: calculate (2n+1) correctly before subtracting.

Step 3

Exam Tip

पद (30,27,22,15) हैं इसलिए \(a_4=15\) है। घटाने से पहले (2n+1) सही निकालें।

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FAQs

Mathematics Answer, Explanation and Revision Hints

यदि \(a_1=30\) और (a_{n+1}=a_n-(2n+1)) है तो \(a_4\) क्या होगा? / If \(a_1=30\) and (a_{n+1}=a_n-(2n+1)), what is \(a_4\)?

Correct Answer: A. (15). Explanation: पद (30,27,22,15) हैं इसलिए \(a_4=15\) है। घटाने से पहले (2n+1) सही निकालें। / The terms are (30,27,22,15), so \(a_4=15\). Exam tip: calculate (2n+1) correctly before subtracting.

Which concept should I revise for this Mathematics MCQ?

The terms are (30,27,22,15), so \(a_4=15\). Exam tip: calculate (2n+1) correctly before subtracting.

What exam hint can help solve this Mathematics question?

पद (30,27,22,15) हैं इसलिए \(a_4=15\) है। घटाने से पहले (2n+1) सही निकालें।