883 prompts matching "Proving that a quadratic expression is positive for every real x"
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Common Mistakes: A cubic equation arising from a volume problem
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WAEC Prep: The symbols used for and, or and not
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Common Mistakes: Translating a symbolic statement back into English
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Quiz: Disjunction and the inclusive or
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Common Mistakes: Comparing two statements by their truth tables
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Worked Example: The truth table for the conditional
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WAEC Prep: Why a conditional and its contrapositive are equivalent
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Worked Example: The truth table for the biconditional
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Common Mistakes: Simplifying a compound statement using the laws
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Quiz: What a contingency is
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Common Mistakes: Deciding between tautology, contradiction and contingency
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Spot My Mistake: Disjunctive syllogism
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WAEC Prep: Testing an argument for validity by truth table
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Common Mistakes: The fallacy of denying the antecedent
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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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Common Mistakes: Comparing a line arrangement with a circular one
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Practice: A selection that must include one particular member
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Common Mistakes: The number of ways of dividing a class into groups
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Common Mistakes: A probability found by counting arrangements
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