Proof by Counter example and Contradiction [P2,P4]

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EDEXCEL IAL Pure Mathematics 2 and Pure Mathematics 4 syllabus has included this new topic in the latest specification.
This video explains how to disproof an statement using counter-example and how to prove an statement by contradiction.

0:00 - Disproof an statement using counter-example (example 1)
1:30 - Disproof an statement using counter-example (example 2)
2:15 - Prove by contradiction [ root over 2 is irrational ]

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