Indirect proofs (or proofs by contradiction) prove their conclusion by showing that the opposite cannot be true. You can use this in math and in arguments with your siblings.

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Conditional Statements 
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Logical Reasoning (Problem) 
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Indirect Proofs 
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Formal Proofs 
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Shmoop? What is that? 
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Jane Eyre Summary 
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What is Shmoop? 
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ACT Math 4.5 Elementary Algebra