यदि समांतर श्रेणी में \(a_1=4\) और \(a_5+a_9=80\) है, तो समान अंतर क्या है?
If in an arithmetic progression \(a_1=4\) and \(a_5+a_9=80\), what is the common difference?
Explanation opens after your attempt
B. (6)
Concept
\(a_5=4+4d\) and \(a_9=4+8d\), so (8+12d=80) and (d=6). Write both terms using \(a_1\) and (d).
Why this answer is correct
The correct answer is B. (6). \(a_5=4+4d\) and \(a_9=4+8d\), so (8+12d=80) and (d=6). Write both terms using \(a_1\) and (d).
Exam Tip
\(a_5=4+4d\) और \(a_9=4+8d\), इसलिए (8+12d=80) और (d=6)। दोनों पदों को \(a_1\) और (d) से लिखें।
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