यदि \(a_1=100\) और (a_{n+1}=a_n-\(2n^2+n\)) है तो \(a_4\) क्या होगा?

If \(a_1=100\) and (a_{n+1}=a_n-\(2n^2+n\)), what is \(a_4\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

D. (69)

Step 1

Concept

The subtracted values are (3,10,21), so \(a_4=66\). Exam tip: add all subtractions first and then subtract.

Step 2

Why this answer is correct

The correct answer is D. (69). The subtracted values are (3,10,21), so \(a_4=66\). Exam tip: add all subtractions first and then subtract.

Step 3

Exam Tip

घटने वाले मान (3,10,21) हैं इसलिए \(a_4=66\) नहीं बल्कि (66) होगा। सही गणना में सभी घटाव जोड़कर घटाएँ।

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Mathematics Answer, Explanation and Revision Hints

यदि \(a_1=100\) और (a_{n+1}=a_n-\(2n^2+n\)) है तो \(a_4\) क्या होगा? / If \(a_1=100\) and (a_{n+1}=a_n-\(2n^2+n\)), what is \(a_4\)?

Correct Answer: D. (69). Explanation: घटने वाले मान (3,10,21) हैं इसलिए \(a_4=66\) नहीं बल्कि (66) होगा। सही गणना में सभी घटाव जोड़कर घटाएँ। / The subtracted values are (3,10,21), so \(a_4=66\). Exam tip: add all subtractions first and then subtract.

Which concept should I revise for this Mathematics MCQ?

The subtracted values are (3,10,21), so \(a_4=66\). Exam tip: add all subtractions first and then subtract.

What exam hint can help solve this Mathematics question?

घटने वाले मान (3,10,21) हैं इसलिए \(a_4=66\) नहीं बल्कि (66) होगा। सही गणना में सभी घटाव जोड़कर घटाएँ।