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 \(d_1\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

A. सात(7)

Step 1

Concept

\(d_4=d_1+4+6+8\), so \(d_1=7\). In exams, apply the same rule backward too.

Step 2

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.

Step 3

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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Mathematics Answer, Explanation and Revision Hints

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 \(d_1\)?

Correct Answer: A. सात / (7). Explanation: \(d_4=d_1+4+6+8\), इसलिए \(d_1=7\) है। परीक्षा में पीछे की ओर भी वही नियम लागू करें। / \(d_4=d_1+4+6+8\), so \(d_1=7\). In exams, apply the same rule backward too.

Which concept should I revise for this Mathematics MCQ?

\(d_4=d_1+4+6+8\), so \(d_1=7\). In exams, apply the same rule backward too.

What exam hint can help solve this Mathematics question?

\(d_4=d_1+4+6+8\), इसलिए \(d_1=7\) है। परीक्षा में पीछे की ओर भी वही नियम लागू करें।