अनुक्रम \(7,13,23,37,\ldots\) के लिए सही स्पष्ट नियम कौन-सा है?
Which explicit rule is correct for the sequence \(7,13,23,37,\ldots\)?
Explanation opens after your attempt
A. \(a_n=2n^2+5\)
Concept
\(2n^2+5\) gives (7,13,23,37). In exams check a quadratic rule when second differences are constant.
Why this answer is correct
The correct answer is A. \(a_n=2n^2+5\). \(2n^2+5\) gives (7,13,23,37). In exams check a quadratic rule when second differences are constant.
Exam Tip
\(2n^2+5\) से (7,13,23,37) मिलते हैं। परीक्षा में दूसरे अंतर समान हों तो वर्गीय नियम जाँचें।
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