यदि \(a_1=40\) और \(a_{n+1}=a_n-\frac{3n}{2}\) है तो \(a_5\) क्या होगा?

If \(a_1=40\) and \(a_{n+1}=a_n-\frac{3n}{2}\), what is \(a_5\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

B. (25)

Step 1

Concept

The total subtraction is (\frac{3(1+2+3+4)}{2}=15), so \(a_5=25\). Exam tip: calculate total fractional subtraction first.

Step 2

Why this answer is correct

The correct answer is B. (25). The total subtraction is (\frac{3(1+2+3+4)}{2}=15), so \(a_5=25\). Exam tip: calculate total fractional subtraction first.

Step 3

Exam Tip

कुल घटाव (\frac{3(1+2+3+4)}{2}=15) है इसलिए \(a_5=25\) है। भिन्न घटाव में कुल घटाव पहले निकालें।

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Mathematics Answer, Explanation and Revision Hints

यदि \(a_1=40\) और \(a_{n+1}=a_n-\frac{3n}{2}\) है तो \(a_5\) क्या होगा? / If \(a_1=40\) and \(a_{n+1}=a_n-\frac{3n}{2}\), what is \(a_5\)?

Correct Answer: B. (25). Explanation: कुल घटाव (\frac{3(1+2+3+4)}{2}=15) है इसलिए \(a_5=25\) है। भिन्न घटाव में कुल घटाव पहले निकालें। / The total subtraction is (\frac{3(1+2+3+4)}{2}=15), so \(a_5=25\). Exam tip: calculate total fractional subtraction first.

Which concept should I revise for this Mathematics MCQ?

The total subtraction is (\frac{3(1+2+3+4)}{2}=15), so \(a_5=25\). Exam tip: calculate total fractional subtraction first.

What exam hint can help solve this Mathematics question?

कुल घटाव (\frac{3(1+2+3+4)}{2}=15) है इसलिए \(a_5=25\) है। भिन्न घटाव में कुल घटाव पहले निकालें।