यदि \(a_1=50\) और \(a_{n+1}=a_n-n^2\) है तो \(a_5\) क्या होगा?

If \(a_1=50\) and \(a_{n+1}=a_n-n^2\), what is \(a_5\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

A. (20)

Step 1

Concept

The terms are (50,49,45,36,20), so \(a_5=20\). Exam tip: subtract the squares (1,4,9,16) in order.

Step 2

Why this answer is correct

The correct answer is A. (20). The terms are (50,49,45,36,20), so \(a_5=20\). Exam tip: subtract the squares (1,4,9,16) in order.

Step 3

Exam Tip

पद (50,49,45,36,20) हैं इसलिए \(a_5=20\) है। वर्गों (1,4,9,16) को क्रम से घटाएँ।

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Mathematics Answer, Explanation and Revision Hints

यदि \(a_1=50\) और \(a_{n+1}=a_n-n^2\) है तो \(a_5\) क्या होगा? / If \(a_1=50\) and \(a_{n+1}=a_n-n^2\), what is \(a_5\)?

Correct Answer: A. (20). Explanation: पद (50,49,45,36,20) हैं इसलिए \(a_5=20\) है। वर्गों (1,4,9,16) को क्रम से घटाएँ। / The terms are (50,49,45,36,20), so \(a_5=20\). Exam tip: subtract the squares (1,4,9,16) in order.

Which concept should I revise for this Mathematics MCQ?

The terms are (50,49,45,36,20), so \(a_5=20\). Exam tip: subtract the squares (1,4,9,16) in order.

What exam hint can help solve this Mathematics question?

पद (50,49,45,36,20) हैं इसलिए \(a_5=20\) है। वर्गों (1,4,9,16) को क्रम से घटाएँ।