यदि समांतर श्रेणी में \(a_4=18\) और \(a_9=48\) है, तो \(a_{12}\) क्या होगा?
If an arithmetic progression has \(a_4=18\) and \(a_9=48\), what is \(a_{12}\)?
Explanation opens after your attempt
C. (66)
Concept
The increase over five gaps is (30), so (d=6) and (a_{12}=48+3(6)=66). First find (d), then move forward.
Why this answer is correct
The correct answer is C. (66). The increase over five gaps is (30), so (d=6) and (a_{12}=48+3(6)=66). First find (d), then move forward.
Exam Tip
पाँच अंतरों में वृद्धि (30) है, इसलिए (d=6) और (a_{12}=48+3(6)=66)। पहले (d) निकालें फिर आगे बढ़ें।
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