गुणोत्तर श्रेणी \(11,22,44,\ldots\) में \(a_n=1408\) हो तो (n) क्या है?
In the geometric progression \(11,22,44,\ldots\), if \(a_n=1408\), what is (n)?
Explanation opens after your attempt
B. (8)
Concept
From \(11\cdot2^{n-1}=1408\), \(2^{n-1}=128=2^7\), so (n=8). In exams factor first and compare powers.
Why this answer is correct
The correct answer is B. (8). From \(11\cdot2^{n-1}=1408\), \(2^{n-1}=128=2^7\), so (n=8). In exams factor first and compare powers.
Exam Tip
\(11\cdot2^{n-1}=1408\) से \(2^{n-1}=128=2^7\) इसलिए (n=8) है। परीक्षा में गुणनखंड निकालकर घात तुलना करें।
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