यदि \(a_n=n^2+n+1\) है, तो चौथा पद क्या होगा?
If \(a_n=n^2+n+1\), what is the fourth term?
Explanation opens after your attempt
C. (21)
Concept
\(a_4=4^2+4+1=21\). In exams, add both the square and the term number.
Why this answer is correct
The correct answer is C. (21). \(a_4=4^2+4+1=21\). In exams, add both the square and the term number.
Exam Tip
\(a_4=4^2+4+1=21\) है। परीक्षा में वर्ग और पद संख्या दोनों जोड़ें।
Login to save your score, XP, coins and progress.
