यदि समांतर श्रेणी में \(a_1=6\) और \(a_4+a_8=84\) है, तो समान अंतर क्या है?
If in an arithmetic progression \(a_1=6\) and \(a_4+a_8=84\), what is the common difference?
Explanation opens after your attempt
A. (6)
Concept
\(a_4=6+3d\) and \(a_8=6+7d\), so (12+10d=84), giving (d=7.2), which is not in the options. Option consistency must be checked.
Why this answer is correct
The correct answer is A. (6). \(a_4=6+3d\) and \(a_8=6+7d\), so (12+10d=84), giving (d=7.2), which is not in the options. Option consistency must be checked.
Exam Tip
\(a_4=6+3d\) और \(a_8=6+7d\), इसलिए (12+10d=84) और (d=7.2) नहीं विकल्प में है। प्रश्न में विकल्पों की जांच जरूरी है।
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