अनुक्रम \(15,45,135,405,\ldots\) के लिए सही सामान्य पद कौन-सा है?
Which general term is correct for the sequence \(15,45,135,405,\ldots\)?
Explanation opens after your attempt
B. \(a_n=5\cdot3^n\)
Concept
\(5\cdot3^n\) gives (15,45,135,405). In exams check both the base and multiplier in geometric growth.
Why this answer is correct
The correct answer is B. \(a_n=5\cdot3^n\). \(5\cdot3^n\) gives (15,45,135,405). In exams check both the base and multiplier in geometric growth.
Exam Tip
\(5\cdot3^n\) से (15,45,135,405) मिलते हैं। परीक्षा में गुणोत्तर वृद्धि में आधार और गुणक दोनों जाँचें।
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