877 prompts matching "Structured question: quadratic formula question with a negative discriminant"
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Practice: What logical equivalence means
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Explain Back: Showing two statements equivalent by truth table
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Show All Working: The distributive laws in logic
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Common Mistakes: Simplifying a compound statement using the laws
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Worked Example: What a contradiction is
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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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Show All Working: The negation of 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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Practice: Modus tollens
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Explain Back: The rule of syllogism
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Show All Working: The fallacy of affirming the consequent
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Common Mistakes: The fallacy of denying the antecedent
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Worked Example: Arranging r of n objects in a line
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Explain Back: Arrangements restricted at the first letter
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Show All Working: Arrangements of boys and girls alternately
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Common Mistakes: Arranging objects when some must stay in a fixed order
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Worked Example: The number of ways n people sit round a round table
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Worked Example: Selections in which the order does not matter
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