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Why is the initial assumption considered false in the contradiction method?

Answer and explanation

Correct answer: Because it leads to an impossible situation

The governing concept is proof by contradiction, also called reductio ad absurdum. To prove a statement such as the irrationality of a square root, we temporarily assume the opposite—for example, that the number is rational and can be written as a fraction in lowest terms. Algebraic reasoning then produces a result that conflicts with the original lowest-form or divisibility condition. Since a valid assumption cannot logically lead to an impossibility, the assumed opposite statement must be false. Therefore, option A is correct. Being small, containing a decimal, or lacking a diagram has no role in deciding whether the assumption is false.

Related tags

Number-SystemsProof-By-ContradictionIrrationalityMathematical-LogicProof Of Irrationality Of Square Root 2 And Square Root 3Number SystemsMathematicsClass 9 Mcq

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