724 prompts matching "Setting out Cramer's rule for three simultaneous equations"
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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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Spot My Mistake: The law of the excluded middle
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Learn: What makes an argument valid
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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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Learn: Arranging five different books on a shelf
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Worked Example: Arranging r of n objects in a line
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Quiz: Arrangements of a word with no repeated letters
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Practice: Arrangements of a word with repeated letters
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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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Learn: What makes a permutation cyclic
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Worked Example: The number of ways n people sit round a round table
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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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