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

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

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

B. (27)

Step 1

Concept

\(a_4=30-\frac{1+2+3}{2}=27\). Exam tip: find the total subtraction first with fractions.

Step 2

Why this answer is correct

The correct answer is B. (27). \(a_4=30-\frac{1+2+3}{2}=27\). Exam tip: find the total subtraction first with fractions.

Step 3

Exam Tip

\(a_4=30-\frac{1+2+3}{2}=27\) है। भिन्न घटाते समय कुल घटाव पहले निकालें।

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FAQs

Mathematics Answer, Explanation and Revision Hints

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

Correct Answer: B. (27). Explanation: \(a_4=30-\frac{1+2+3}{2}=27\) है। भिन्न घटाते समय कुल घटाव पहले निकालें। / \(a_4=30-\frac{1+2+3}{2}=27\). Exam tip: find the total subtraction first with fractions.

Which concept should I revise for this Mathematics MCQ?

\(a_4=30-\frac{1+2+3}{2}=27\). Exam tip: find the total subtraction first with fractions.

What exam hint can help solve this Mathematics question?

\(a_4=30-\frac{1+2+3}{2}=27\) है। भिन्न घटाते समय कुल घटाव पहले निकालें।