गुणोत्तर श्रेढ़ी में \(a_2=25\) और \(a_5=675\) है। धनात्मक (r) के लिए \(a_4\) क्या होगा?
In a geometric progression, \(a_2=25\) and \(a_5=675\). For positive (r), what will \(a_4\) be?
Explanation opens after your attempt
B. (225)
Concept
\(a_5=a_2r^3\), so \(675=25r^3\) and (r=3), hence \(a_4=25\cdot3^2=225\). Find the ratio first.
Why this answer is correct
The correct answer is B. (225). \(a_5=a_2r^3\), so \(675=25r^3\) and (r=3), hence \(a_4=25\cdot3^2=225\). Find the ratio first.
Exam Tip
\(a_5=a_2r^3\), इसलिए \(675=25r^3\) और (r=3), अतः \(a_4=25\cdot3^2=225\)। पहले अनुपात निकालें।
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