अनुक्रम \(3,18,43,78,\ldots\) के लिए सही सामान्य पद कौन-सा है?
Which general term is correct for the sequence \(3,18,43,78,\ldots\)?
Explanation opens after your attempt
A. \(a_n=5n^2-2\)
Concept
\(5n^2-2\) gives (3,18,43,78). In exams check a quadratic rule when second differences are constant.
Why this answer is correct
The correct answer is A. \(a_n=5n^2-2\). \(5n^2-2\) gives (3,18,43,78). In exams check a quadratic rule when second differences are constant.
Exam Tip
\(5n^2-2\) से (3,18,43,78) मिलते हैं। परीक्षा में दूसरे अंतर समान देखकर वर्गीय नियम जाँचें।
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