In proving √5 as irrational, we begin with assumption √5 is rational in which type of proof?

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📊 Discrete Mathematics

Q. In proving √5 as irrational, we begin with assumption √5 is rational in which type of proof?

(A) direct proof
(B) proof by contradiction
(C) vacuous proof
(D) mathematical induction

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✅ Correct Answer: (B) proof by contradiction

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