Covers the principle of counterexamples as well as proofs to do with even/oddness, consecutive numbers and digits. For high ability students.
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5 d) is false because IF BOTH a and b are smaller than -1 (negative), then ab>1 (for example -2 times -3=6 which is bigger than 1. So the docx is right
how can 5 d) in the counterexamples.docx be false.maybe the question is wrong