यदि \(a_n=kn+5\) और \(a_{15}-a_6=63\) है तो \(a_{20}\) क्या होगा?
If \(a_n=kn+5\) and \(a_{15}-a_6=63\), what is \(a_{20}\)?
Explanation opens after your attempt
C. (145)
Concept
From (9k=63), (k=7). Therefore \(a_{20}=7\times20+5=145\).
Why this answer is correct
The correct answer is C. (145). From (9k=63), (k=7). Therefore \(a_{20}=7\times20+5=145\).
Exam Tip
(9k=63) से (k=7)। इसलिए \(a_{20}=7\times20+5=145\)।
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