यदि \(a_n=5n^2-4n+1\) है तो (400) से छोटे कितने पद होंगे?

If \(a_n=5n^2-4n+1\), how many terms will be less than (400)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

B. (9)

Step 1

Concept

\(a_9=370\) and \(a_{10}=461\), so (9) terms are less than (400). Exam tip: always check terms near the boundary.

Step 2

Why this answer is correct

The correct answer is B. (9). \(a_9=370\) and \(a_{10}=461\), so (9) terms are less than (400). Exam tip: always check terms near the boundary.

Step 3

Exam Tip

\(a_9=370\) और \(a_{10}=461\) है इसलिए (9) पद (400) से छोटे हैं। सीमा के पास के पद अवश्य जाँचें।

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Mathematics Answer, Explanation and Revision Hints

यदि \(a_n=5n^2-4n+1\) है तो (400) से छोटे कितने पद होंगे? / If \(a_n=5n^2-4n+1\), how many terms will be less than (400)?

Correct Answer: B. (9). Explanation: \(a_9=370\) और \(a_{10}=461\) है इसलिए (9) पद (400) से छोटे हैं। सीमा के पास के पद अवश्य जाँचें। / \(a_9=370\) and \(a_{10}=461\), so (9) terms are less than (400). Exam tip: always check terms near the boundary.

Which concept should I revise for this Mathematics MCQ?

\(a_9=370\) and \(a_{10}=461\), so (9) terms are less than (400). Exam tip: always check terms near the boundary.

What exam hint can help solve this Mathematics question?

\(a_9=370\) और \(a_{10}=461\) है इसलिए (9) पद (400) से छोटे हैं। सीमा के पास के पद अवश्य जाँचें।