यदि गुणोत्तर श्रेढ़ी में \(a_2+a_4=170\) और (r=2) है, तो पहला पद \(a_1\) क्या होगा?
If in a geometric progression \(a_2+a_4=170\) and (r=2), what will be the first term \(a_1\)?
Explanation opens after your attempt
C. (17)
Concept
\(a_2=2a_1\) and \(a_4=8a_1\), so \(10a_1=170\) and \(a_1=17\). First write the sum using \(a_1\) and (r).
Why this answer is correct
The correct answer is C. (17). \(a_2=2a_1\) and \(a_4=8a_1\), so \(10a_1=170\) and \(a_1=17\). First write the sum using \(a_1\) and (r).
Exam Tip
\(a_2=2a_1\) और \(a_4=8a_1\), इसलिए \(10a_1=170\) और \(a_1=17\)। योग को पहले \(a_1\) और (r) से लिखें।
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