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)?
Explanation opens after your attempt
B. (9)
Concept
\(a_9=370\) and \(a_{10}=461\), so (9) terms are less than (400). Exam tip: always check terms near the boundary.
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.
Exam Tip
\(a_9=370\) और \(a_{10}=461\) है इसलिए (9) पद (400) से छोटे हैं। सीमा के पास के पद अवश्य जाँचें।
Login to save your score, XP, coins and progress.
