यदि \(a_1=9\) और \(a_{n+1}=a_n+2n-2\) है तो \(a_4\) क्या होगा?
If \(a_1=9\) and \(a_{n+1}=a_n+2n-2\), what is \(a_4\)?
Explanation opens after your attempt
B. (15)
Concept
The terms are (9,9,11,15), so \(a_4=15\). Exam tip: (2n-2) changes at each step.
Why this answer is correct
The correct answer is B. (15). The terms are (9,9,11,15), so \(a_4=15\). Exam tip: (2n-2) changes at each step.
Exam Tip
पद (9,9,11,15) हैं इसलिए \(a_4=15\) है। (2n-2) का मान हर चरण में बदलता है।
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