Expert Mathematics Chapter 1: Real Numbers Class 10 Level 17

कौन-सा विकल्प \(\sqrt{2}\) के प्रमाण में सम-विषम विचार की सही व्याख्या करता है?

Which option correctly explains the parity idea in the proof for \(\sqrt{2}\)?

Explanation opens after your attempt
Correct Answer

A. यदि संख्या विषम होती, तो उसका वर्ग विषम होता; पर वर्ग सम है, इसलिए संख्या सम हैIf the number were odd, its square would be odd; but the square is even, so the number is even

Step 1

Concept

The square of an odd number is always odd.

Step 2

Why this answer is correct

When the square is even, the original number cannot be odd.

Step 3

Exam Tip

This idea proves both (p) and (q) even. चरण 1: विषम संख्या का वर्ग हमेशा विषम होता है। चरण 2: जब वर्ग सम मिला, तो मूल संख्या विषम नहीं हो सकती। चरण 3: इस विचार से (p) और (q) दोनों के सम होने का प्रमाण बनता है।

FAQs

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What is the correct answer to this Mathematics MCQ?

The correct answer is A. यदि संख्या विषम होती, तो उसका वर्ग विषम होता; पर वर्ग सम है, इसलिए संख्या सम है / If the number were odd, its square would be odd; but the square is even, so the number is even.

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