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 \(d_1\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

A. तेरह(13)

Step 1

Concept

\(d_5=d_1+9+14+19+24\), so \(d_1=13\). In exams, subtract the added quantities when working backward.

Step 2

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.

Step 3

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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Mathematics Answer, Explanation and Revision Hints

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 \(d_1\)?

Correct Answer: A. तेरह / (13). Explanation: \(d_5=d_1+9+14+19+24\), इसलिए \(d_1=13\) है। परीक्षा में उल्टी दिशा में जोड़ी गई राशियाँ घटाएँ। / \(d_5=d_1+9+14+19+24\), so \(d_1=13\). In exams, subtract the added quantities when working backward.

Which concept should I revise for this Mathematics MCQ?

\(d_5=d_1+9+14+19+24\), so \(d_1=13\). In exams, subtract the added quantities when working backward.

What exam hint can help solve this Mathematics question?

\(d_5=d_1+9+14+19+24\), इसलिए \(d_1=13\) है। परीक्षा में उल्टी दिशा में जोड़ी गई राशियाँ घटाएँ।