अनुक्रम \(4,12,24,40,\ldots\) का सामान्य पद क्या है?
What is the general term of the sequence \(4,12,24,40,\ldots\)?
Explanation opens after your attempt
B. \(a_n=2n^2+2n\)
Concept
\(2n^2+2n\) gives (4,12,24,40). In exams, check a quadratic rule when second differences are constant.
Why this answer is correct
The correct answer is B. \(a_n=2n^2+2n\). \(2n^2+2n\) gives (4,12,24,40). In exams, check a quadratic rule when second differences are constant.
Exam Tip
\(2n^2+2n\) से (4,12,24,40) मिलते हैं। परीक्षा में दूसरे अंतर समान हों तो वर्गीय नियम जाँचें।
Login to save your score, XP, coins and progress.
