यदि \(a_{24}=7a_{9}-18\) और \(a_9=42\) है, तो \(a_{39}\) क्या होगा?
If \(a_{24}=7a_9-18\) and \(a_9=42\), what is \(a_{39}\)?
Explanation opens after your attempt
Correct Answer
C. (504)
Concept
\(a_{24}=276\) and (15d=234), so \(d=\frac{78}{5}\). \(a_{39}=276+15\cdot\frac{78}{5}=510\).
Why this answer is correct
The correct answer is C. (504). \(a_{24}=276\) and (15d=234), so \(d=\frac{78}{5}\). \(a_{39}=276+15\cdot\frac{78}{5}=510\).
Exam Tip
\(a_{24}=276\) और (15d=234), इसलिए \(d=\frac{78}{5}\)। \(a_{39}=276+15\cdot\frac{78}{5}=510\)।
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