Concept-wise Practice

proof-method MCQ Questions for Class 10

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Practice Questions

1 questions tagged with proof-method.

Question 1/1 Hard Mathematics Chapter 1: Real Numbers 6: Proof of irrationality of √2, √3, √5 Class 10 Level 18

\(\sqrt{2}\), \(\sqrt{3}\), \(\sqrt{5}\) की अपरिमेयता सिद्ध करने में किस प्रकार के प्रमाण का प्रयोग सबसे सामान्य है?

Which type of proof is most commonly used to prove the irrationality of \(\sqrt{2}\), \(\sqrt{3}\), and \(\sqrt{5}\)?

Explanation opens after your attempt
Correct Answer

A. विरोधाभास द्वारा प्रमाणProof by contradiction

Step 1

Concept

In these proofs, the square root is first assumed rational.

Step 2

Why this answer is correct

Then an impossible situation appears because numerator and denominator get a common factor.

Step 3

Exam Tip

Hence this is called proof by contradiction. चरण 1: इन प्रमाणों में पहले वर्गमूल को परिमेय मानते हैं। चरण 2: फिर अंश और हर में साझा गुणनखंड मिलने से असंभव स्थिति आती है। चरण 3: इसलिए इसे विरोधाभास द्वारा प्रमाण कहते हैं।

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