यदि \(a_1=12\) और \(a_{n}=3a_{n-1}+2\) नहीं बल्कि AP का (a_n=12+(n-1)d) है तथा \(a_9=68\) है तो \(a_{22}\) क्या होगा?
If \(a_1=12\) and it is not \(a_n=3a_{n-1}+2\) but an AP with (a_n=12+(n-1)d), and \(a_9=68\), what is \(a_{22}\)?
Explanation opens after your attempt
A. (159)
Concept
From (68=12+8d), (d=7). Therefore \(a_{22}=12+21\times7=159\).
Why this answer is correct
The correct answer is A. (159). From (68=12+8d), (d=7). Therefore \(a_{22}=12+21\times7=159\).
Exam Tip
(68=12+8d) से (d=7)। इसलिए \(a_{22}=12+21\times7=159\)।
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