यदि \(a_1=3\) और \(a_{n+1}=a_n+2n\) है तो \(a_5\) क्या होगा?
If \(a_1=3\) and \(a_{n+1}=a_n+2n\), what is \(a_5\)?
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D. 23
Simple Explanation
पुनरावृत्ति नियम में प्रत्येक चरण पर वर्तमान पद में उस चरण का 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0ুযোগ? / Starting with \(a_1=3\), apply the rule successively: \(a_2=3+2(1)=5\), \(a_3=5+2(2)=9\), \(a_4=9+2(3)=15\), and \(a_5=15+2(4)=23\). Hence, the correct answer is 23. The value 15 is \(a_4\), not \(a_5\). Exam tip: substitute \(n=1,2,3,\ldots\) one step at a time in a recursive rule.
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