किस (x) के लिए (9,x,49) धनात्मक गुणोत्तर श्रेढ़ी के लगातार पद होंगे?
For which (x) will (9,x,49) be consecutive terms of a positive geometric progression?
Explanation opens after your attempt
B. (21)
Concept
\(x^2=9\cdot49=441\), so positive (x=21). The middle term is the geometric mean.
Why this answer is correct
The correct answer is B. (21). \(x^2=9\cdot49=441\), so positive (x=21). The middle term is the geometric mean.
Exam Tip
\(x^2=9\cdot49=441\), इसलिए धनात्मक (x=21)। मध्य पद ज्यामितीय माध्य होता है।
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