यदि \(a_1=6\) और \(a_{n+1}=a_n+9n-4\) है तो \(a_4\) क्या होगा?
If \(a_1=6\) and \(a_{n+1}=a_n+9n-4\), what is \(a_4\)?
Explanation opens after your attempt
D. (48)
Concept
The added values are (5,14,23), so \(a_4=48\). Exam tip: (9n-4) changes at each step.
Why this answer is correct
The correct answer is D. (48). The added values are (5,14,23), so \(a_4=48\). Exam tip: (9n-4) changes at each step.
Exam Tip
जुड़ने वाले मान (5,14,23) हैं इसलिए \(a_4=48\) है। (9n-4) का मान हर चरण में बदलता है।
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