Concept-wise Practice

proof-direction MCQ Questions for Class 10

proof-direction se related questions ko ek jagah revise karein. Har question me bilingual content, answer feedback aur explanation available hai.

Practice Questions

1 questions tagged with proof-direction.

Question 1/1 Expert Mathematics Chapter 1: Real Numbers 6: Proof of irrationality of √2, √3, √5 Class 10 Level 17

यदि \(\sqrt{5}\) को परिमेय मानने पर \(x^2=5y^2\) मिलता है, तो (x) को (5n) लिखने के बाद प्रमाण किस निष्कर्ष की ओर बढ़ता है?

If assuming \(\sqrt{5}\) rational gives \(x^2=5y^2\), after writing (x=5n), toward which conclusion does the proof move?

Explanation opens after your attempt
Correct Answer

A. \(5\mid y\)

Step 1

Concept

Putting (x=5n) gives \(y^2=5n^2\).

Step 2

Why this answer is correct

So \(5\mid y^2\), and by the prime rule \(5\mid y\).

Step 3

Exam Tip

Then (5) becomes common to both (x) and (y). चरण 1: (x=5n) रखने से \(y^2=5n^2\) मिलता है। चरण 2: इससे \(5\mid y^2\), और अभाज्य नियम से \(5\mid y\) निकलता है। चरण 3: तब (x) और (y) दोनों में (5) साझा हो जाता है।

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