अनुक्रम \(1,5,21,73,\ldots\) के लिए सही स्पष्ट नियम कौन-सा है?
Which explicit rule is correct for the sequence \(1,5,21,73,\ldots\)?
Explanation opens after your attempt
C. \(a_n=3^n-2n\)
Concept
\(3^n-2n\) gives (1,5,21,73). In exams also test options where a linear term is subtracted from a power.
Why this answer is correct
The correct answer is C. \(a_n=3^n-2n\). \(3^n-2n\) gives (1,5,21,73). In exams also test options where a linear term is subtracted from a power.
Exam Tip
\(3^n-2n\) से (1,5,21,73) मिलते हैं। परीक्षा में घात में से रैखिक पद घटाकर भी विकल्प जाँचें।
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