1,045 prompts matching "Selections in which at least one of a kind must appear"
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Final Revision: An argument written in words and tested for validity
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Learn: Arranging five different books on a shelf
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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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Show All Working: The complement rule used in a counting problem
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Final Revision: A word problem about a lottery draw
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Learn: Building Pascal's triangle row by row
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Show All Working: The binomial coefficients written as n choose r
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Learn: The formula for the general term of an expansion
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Show All Working: The general term when the bracket contains a fraction
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Final Revision: A question asking for two coefficients to be equal
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Spot my mistake in factorising x^2+5x+6
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Worked example: factorising a harder trinomial
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Solve x^2 + 5x + 6 = 0 by factorisation
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Solve x^2 - 7x + 12 = 0 by factorisation
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Solve 2x^2 + 7x + 3 = 0 by factorisation
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Solve x^2 - 3x - 10 = 0 by factorisation
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Solve 3x^2 - 5x - 2 = 0 by factorisation
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Solve x^2 - 6x + 9 = 0 by factorisation
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Solve 2x^2 - 11x + 5 = 0 by factorisation
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