1,045 prompts matching "The coefficient of variation, for comparing two sets"
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Practice: Negation combined with a compound statement
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Spot My Mistake: Building a truth table column by column
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Quiz: Why a conditional with a false antecedent counts as true
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Show All Working: Why a conditional and its converse are not equivalent
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Final Revision: A conditional statement set in an everyday situation
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Practice: What logical equivalence means
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Spot My Mistake: De Morgan's laws in logic
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Worked Example: What a contradiction is
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Quiz: What a contingency is
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Practice: Showing that a statement is a tautology
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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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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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Spot My Mistake: Arrangements round a table with men and women alternating
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Final Revision: A word problem about seating at a round table
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Practice: A selection that must include one particular member
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