गुणोत्तर श्रेणी \(4,12,36,\ldots\) का वह पद कौन-सा है जो (972) है?
Which term of the geometric progression \(4,12,36,\ldots\) is (972)?
Explanation opens after your attempt
C. छठा पद(6)th term
Concept
From \(4\cdot3^{n-1}=972\), \(3^{n-1}=243=3^5\), so (n=6). In exams, compare powers to find the term number.
Why this answer is correct
The correct answer is C. छठा पद / (6)th term. From \(4\cdot3^{n-1}=972\), \(3^{n-1}=243=3^5\), so (n=6). In exams, compare powers to find the term number.
Exam Tip
\(4\cdot3^{n-1}=972\) से \(3^{n-1}=243=3^5\), इसलिए (n=6) है। परीक्षा में पद संख्या के लिए घात की तुलना करें।
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