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3 cards from this section. Quick, good the night before a test.
Define direct reasoning in your own words.
Think of a path without branches.
What is an example of a counterexample for the statement 'All swans are white'?
Consider other colors of swans.
What is direct reasoning?
Think of a straight path.
True or False: A counterexample can help to prove a statement true.
Remember what a counterexample is for.
Using indirect reasoning, prove that if two angles are supplementary, then each angle is less than 180 degrees.
Consider the properties of angles and their sum.
Construct a universe of examples where 'All rectangles are squares' is false using counterexamples.
Remember the definitions of rectangles and squares.
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