Expert Mathematics Chapter 1: Real Numbers Class 10 Level 18

\(\sqrt{5}\) के प्रमाण में यदि कोई \(5\mid a^2\) से (a=25k) लिख दे, तो गलती क्या है?

In the proof for \(\sqrt{5}\), if someone writes (a=25k) from \(5\mid a^2\), what is the mistake?

Explanation opens after your attempt
Correct Answer

A. \(5\mid a^2\) से केवल \(5\mid a\) मिलता है, \(25\mid a\) जरूरी नहींFrom \(5\mid a^2\), only \(5\mid a\) follows, \(25\mid a\) is not necessary

Step 1

Concept

By the prime rule, \(5\mid a^2\) gives \(5\mid a\).

Step 2

Why this answer is correct

So (a=5k) is correct, but (a=25k) is not necessary.

Step 3

Exam Tip

Avoid making extra claims in proofs. चरण 1: अभाज्य नियम से \(5\mid a^2\) होने पर \(5\mid a\) मिलता है। चरण 2: इससे (a=5k) लिखना सही है, (a=25k) आवश्यक नहीं। चरण 3: प्रमाण में अतिरिक्त दावा करने से बचें।

FAQs

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What is the correct answer to this Mathematics MCQ?

The correct answer is A. \(5\mid a^2\) से केवल \(5\mid a\) मिलता है, \(25\mid a\) जरूरी नहीं / From \(5\mid a^2\), only \(5\mid a\) follows, \(25\mid a\) is not necessary.

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