1,045 prompts matching "Arrangements restricted at the first or the last place"
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Explain Back: Showing two statements equivalent by truth table
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Spot My Mistake: De Morgan's laws in logic
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Learn: What a tautology is
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Quiz: What a contingency is
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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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Explain Back: The rule of 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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Final Revision: An argument written in words and tested for validity
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Worked Example: Arranging r of n objects in a line
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WAEC Prep: Arrangements with two particular items not adjacent
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Common Mistakes: Arranging objects when some must stay in a fixed order
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Learn: What makes a permutation cyclic
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Explain Back: A selection that must exclude one particular member
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Spot My Mistake: A selection with at least a stated number of one kind
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Common Mistakes: The number of ways of dividing a class into groups
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Quiz: The probability of drawing two red balls
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