यदि \(a_1=5\) और पहले (6) पदों का योग (120) है, तो समान अंतर क्या है?
If \(a_1=5\) and the sum of the first (6) terms is (120), what is the common difference?
Explanation opens after your attempt
C. (6)
Concept
(\frac{6}{2}[2(5)+5d]=120) gives (30+15d=120) and (d=6). In sum questions, substitute (n) and (a) first.
Why this answer is correct
The correct answer is C. (6). (\frac{6}{2}[2(5)+5d]=120) gives (30+15d=120) and (d=6). In sum questions, substitute (n) and (a) first.
Exam Tip
(\frac{6}{2}[2(5)+5d]=120) से (30+15d=120) और (d=6)। योग वाले प्रश्न में पहले (n) और (a) रखें।
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