Update

Muft Shiksha™ एक 100% Free Education Portal है 🇮🇳, जिसका उद्देश्य Class 9–12 के हर विद्यार्थी तक High-Quality Education को पूरी तरह मुफ्त पहुँचाना है। 🇮🇳 हम मानते हैं कि अच्छी शिक्षा किसी student की आर्थिक स्थिति पर निर्भर नहीं होनी चाहिए। 🇮🇳 हर विद्यार्थी को वही Quality Study Material, MCQs, Quizzes, Exam Preparation, Concept-Based Learning और Bilingual Support मिलना चाहिए, जो आमतौर पर महंगी Coaching या Premium Platforms में मिलता है। Muft Shiksha™ 🇮🇳 इसी सोच के साथ बनाया गया है

Subjects
0 reads0 ratings0 helpful

What is the correct difference between the roles of (y\neq0) and (\gcd(x,y)=1) in the proof of (\sqrt{2})?

Answer and explanation

Correct answer: (y\neq0) keeps the fraction defined, (\gcd(x,y)=1) gives contradiction

In a proof by contradiction, a rational number is written as a fraction such as \(x/y\), where \(x\) and \(y\) are integers. The condition \(y\neq0\) is needed simply because division by zero is not defined. It allows the fraction to represent a number. The condition \(\gcd(x,y)=1\) says that the fraction has already been reduced to lowest terms; it is not merely a requirement for writing the fraction.

For \(\sqrt{2}=x/y\), squaring gives \(x^2=2y^2\). This shows that \(x\) is even, and then \(y\) is also even. Thus both numbers have a common factor 2, contradicting \(\gcd(x,y)=1\). Therefore option A correctly separates the roles: the non-zero denominator keeps the fraction meaningful, while the coprime condition is what the final common factor contradicts.

Related tags

Number-SystemsDenominatorGcdSqrt2

Was this question useful?

No ratings yetWrite a review / Rate this question

Student Reviews

No published reviews yet.

Add Muft Shiksha to your Home Screen

In Safari, tap Share, then Add to Home Screen.