यदि \(a_n=kn^2+2n\) और \(a_4=56\) है तो \(a_7\) का मान क्या होगा?
If \(a_n=kn^2+2n\) and \(a_4=56\), what will be the value of \(a_7\)?
Explanation opens after your attempt
A. (161)
Concept
From (16k+8=56), (k=3). Therefore \(a_7=3\times49+14=161\).
Why this answer is correct
The correct answer is A. (161). From (16k+8=56), (k=3). Therefore \(a_7=3\times49+14=161\).
Exam Tip
(16k+8=56) से (k=3) है। इसलिए \(a_7=3\times49+14=161\) होगा।
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