513 prompts matching "Sigma notation for a sum"
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Spot My Mistake: The law of the excluded middle
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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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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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Spot My Mistake: Arrangements with two particular items adjacent
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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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Spot My Mistake: Arrangements round a table with men and women alternating
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Worked Example: Selections in which the order does not matter
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Quiz: Selecting from two groups at the same time
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Practice: A selection that must include 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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Worked Example: Counting the total outcomes with combinations
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Quiz: The probability of drawing two red balls
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Practice: The probability of drawing one ball of each colour
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