यदि \(d_n=d_{n-1}+2n\) और \(d_4=25\) है, तो \(d_1\) का मान क्या होगा?
If \(d_n=d_{n-1}+2n\) and \(d_4=25\), what is the value of \(d_1\)?
Explanation opens after your attempt
A. सात(7)
Concept
\(d_4=d_1+4+6+8\), so \(d_1=7\). In exams, apply the same rule backward too.
Why this answer is correct
The correct answer is A. सात / (7). \(d_4=d_1+4+6+8\), so \(d_1=7\). In exams, apply the same rule backward too.
Exam Tip
\(d_4=d_1+4+6+8\), इसलिए \(d_1=7\) है। परीक्षा में पीछे की ओर भी वही नियम लागू करें।
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