यदि \(a_1=3\) और (a_{n+1}=a_n+(2n+1)2) है तो \(a_4\) क्या होगा?
If \(a_1=3\) and (a_{n+1}=a_n+(2n+1)2), what is \(a_4\)?
Explanation opens after your attempt
B. (86)
Concept
The added values are (9,25,49), so \(a_4=86\). Exam tip: add the odd squares in order.
Why this answer is correct
The correct answer is B. (86). The added values are (9,25,49), so \(a_4=86\). Exam tip: add the odd squares in order.
Exam Tip
जुड़ने वाले मान (9,25,49) हैं इसलिए \(a_4=86\) है। विषम वर्गों को क्रम से जोड़ें।
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