628 prompts matching "Checking a conjugate answer by multiplying back"
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WAEC Prep: Why a conditional and its contrapositive are equivalent
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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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WAEC Prep: The double negation law
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Quiz: What a contingency is
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Spot My Mistake: The law of the excluded middle
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WAEC Prep: A tautology used to justify a rule of algebra
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Quiz: Modus ponens
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Spot My Mistake: Disjunctive syllogism
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Quiz: Arrangements of a word with no repeated letters
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Spot My Mistake: Arrangements with two particular items adjacent
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WAEC Prep: Arrangements with two particular items not adjacent
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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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WAEC Prep: Beads on a necklace, and why the count halves
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Quiz: Selecting from two groups at the same time
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Spot My Mistake: A selection with at least a stated number of one kind
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WAEC Prep: A selection with at most a stated number of one kind
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Quiz: The probability of drawing two red balls
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Spot My Mistake: The probability that a committee contains a given person
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