यदि \(a_1=4\) और \(a_{n+1}=a_n+7n-2\) है तो \(a_3\) क्या होगा?
If \(a_1=4\) and \(a_{n+1}=a_n+7n-2\), what is \(a_3\)?
Explanation opens after your attempt
C. (21)
Concept
The terms are (4,9,21), so \(a_3=21\). Exam tip: (7n-2) changes at each step.
Why this answer is correct
The correct answer is C. (21). The terms are (4,9,21), so \(a_3=21\). Exam tip: (7n-2) changes at each step.
Exam Tip
पद (4,9,21) हैं इसलिए \(a_3=21\) है। (7n-2) का मान हर चरण में बदलता है।
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