909 prompts matching "What a determinant of nought means for a 2 by 2 matrix"
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Final Revision: A conditional statement set in an everyday situation
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Quiz: The biconditional as two conditionals taken together
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Spot My Mistake: De Morgan's laws in logic
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Common Mistakes: Simplifying a compound statement using the laws
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Final Revision: A biconditional used in a mathematical definition
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Practice: Showing that a statement is a tautology
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Explain Back: Showing that a statement is a contradiction
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Common Mistakes: Deciding between tautology, contradiction and contingency
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Worked Example: Premises and conclusion
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Quiz: Modus ponens
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Practice: Modus tollens
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Spot My Mistake: Disjunctive syllogism
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Explain Back: Arrangements restricted at the first letter
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Spot My Mistake: Arrangements with two particular items adjacent
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Common Mistakes: Arranging objects when some must stay in a fixed order
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Quiz: Why one person is fixed in a circular arrangement
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Practice: Circular arrangements with two people together
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Explain Back: Circular arrangements with two people kept apart
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Spot My Mistake: Arrangements round a table with men and women alternating
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Common Mistakes: Comparing a line arrangement with a circular one
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