यदि \(a_1=1\) और \(a_{n+1}=a_n+3n\) है तो \(a_4\) क्या होगा?
If \(a_1=1\) and \(a_{n+1}=a_n+3n\), what is \(a_4\)?
Explanation opens after your attempt
D. (19)
Concept
The terms are (1,4,10,19), so \(a_4=19\). Exam tip: (3n) changes at every step.
Why this answer is correct
The correct answer is D. (19). The terms are (1,4,10,19), so \(a_4=19\). Exam tip: (3n) changes at every step.
Exam Tip
पद (1,4,10,19) हैं इसलिए \(a_4=19\) है। (3n) का मान हर चरण बदलता है।
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