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Proof By Contradiction

Class 9 Mathematics के इस tag से जुड़े questions। हर question के साथ chapter, topic, level और difficulty दी गई है।

MathematicsWhich method is used in the proof of the irrationality of √2?Class 9Number SystemsProof of irrationality of square root 2 and square root 3Level 19Easy MathematicsWhat is the final contradiction in the proof that √2 is irrational?Class 9Number SystemsProof of irrationality of square root 2 and square root 3Level 19Easy MathematicsWhich of the following numbers is irrational and can be proved irrational using a contradiction based on divisibility by 3?Class 9Number SystemsProof of irrationality of square root 2 and square root 3Level 19Easy MathematicsLet r be a non-zero rational number and x be an irrational number. Which of the following statements is always true?Class 9Number SystemsIrrational numbersLevel 15Expert MathematicsLet \(a\) be a rational number and \(b\) be an irrational number. Which of the following expressions will always be irrational?Class 9Number SystemsIrrational numbersLevel 15Expert MathematicsA student claims that \(5-\sqrt{7}\) is rational because 5 is rational and \(\sqrt{7}\) is a number. What is the error in the student's reasoning?Class 9Number SystemsIrrational numbersLevel 15Expert MathematicsIf p and q are irrational numbers and \(p+q\) is rational, which of the following expressions must be irrational?Class 9Number SystemsIrrational numbersLevel 15Expert MathematicsIf \(x\) is an irrational number and \(r\) is a non-zero rational number, what type of number must \(rx\) be?Class 9Number SystemsIrrational numbersLevel 15Expert MathematicsLet \(p\) be a non-zero rational number and \(x\) be an irrational number. Which of the following statements is always true?Class 9Number SystemsIrrational numbersLevel 15Expert MathematicsIf \(p\) is a non-zero rational number and \(q\) is an irrational number, which of the following expressions must always be irrational?Class 9Number SystemsIrrational numbersLevel 15Expert MathematicsA student claims that \(5+\sqrt{7}\) is rational because it is the sum of two real numbers. Which argument proves the claim wrong?Class 9Number SystemsIrrational numbersLevel 14Expert MathematicsLet \(r\) be a rational number. Which statement about \(r+\sqrt{2}\) is always true?Class 9Number SystemsIrrational numbersLevel 14Expert MathematicsReema claims that for any rational number \(r\), \(r+\sqrt{7}\) will be irrational. Which of the following arguments correctly evaluates her claim?Class 9Number SystemsIrrational numbersLevel 14Expert MathematicsLet \(p\) be a rational number and \(x\) be an irrational number. Which of the following statements is always true?Class 9Number SystemsIrrational numbersLevel 14Expert MathematicsLet \(a\) be a non-zero rational number and \(b\) be an irrational number. Which of the following statements is always true?Class 9Number SystemsIrrational numbersLevel 14Expert MathematicsWhich of the following statements is necessarily true?Class 9Number SystemsIrrational numbersLevel 14Expert MathematicsLet \(x\) be an irrational number. Which of the following statements is always true?Class 9Number SystemsIrrational numbersLevel 14Expert MathematicsLet \(x\) be an irrational number and \(q\) be a non-zero rational number. Which of the following statements is always true?Class 9Number SystemsIrrational numbersLevel 14Expert MathematicsLet \(r\) be an irrational number and \(q\) be a non-zero rational number. Which of the following statements is always true?Class 9Number SystemsIrrational numbersLevel 14Expert MathematicsA student claims that \(3+\sqrt{2}\) is a rational number. Which argument proves the student's claim wrong?Class 9Number SystemsIrrational numbersLevel 14Expert