अनुक्रम \(2,7,24,77,\ldots\) के लिए सही स्पष्ट नियम कौन-सा है?
Which explicit rule is correct for the sequence \(2,7,24,77,\ldots\)?
Explanation opens after your attempt
D. \(a_n=3^n-n\)
Concept
\(3^n-n\) gives (2,7,24,77). In exams, also test options where the term number is subtracted from a power.
Why this answer is correct
The correct answer is D. \(a_n=3^n-n\). \(3^n-n\) gives (2,7,24,77). In exams, also test options where the term number is subtracted from a power.
Exam Tip
\(3^n-n\) से (2,7,24,77) मिलते हैं। परीक्षा में घात में से पद संख्या घटाकर भी विकल्प जाँचें।
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