यदि \(d_n=d_{n-1}+5n-1\) और \(d_5=79\) है, तो \(d_1\) का मान क्या होगा?
If \(d_n=d_{n-1}+5n-1\) and \(d_5=79\), what is the value of \(d_1\)?
Explanation opens after your attempt
A. तेरह(13)
Concept
\(d_5=d_1+9+14+19+24\), so \(d_1=13\). In exams, subtract the added quantities when working backward.
Why this answer is correct
The correct answer is A. तेरह / (13). \(d_5=d_1+9+14+19+24\), so \(d_1=13\). In exams, subtract the added quantities when working backward.
Exam Tip
\(d_5=d_1+9+14+19+24\), इसलिए \(d_1=13\) है। परीक्षा में उल्टी दिशा में जोड़ी गई राशियाँ घटाएँ।
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