1,331 prompts matching "Which form of the sum formula to use when r is less than one"
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Quiz: The complement of a set within a stated universal set
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Practice: The difference of two sets, A minus B
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Explain Back: The symmetric difference of two sets
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Spot My Mistake: De Morgan's law that the complement of a union is the intersection of the complements
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Final Revision: The power set, and how many subsets a set of n elements has
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Explain Back: Finding the identity element of a binary operation
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Spot My Mistake: Finding the inverse of an element under a binary operation
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Common Mistakes: Solving an equation in which the unknown sits under a root
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Explain Back: The laws of logarithms for a product and for a quotient
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Spot My Mistake: The power law of logarithms
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Final Revision: Sketching the graph of a logarithmic function
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Worked Example: The discriminant, and what each of its three cases means
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Practice: Finding alpha minus beta from the sum and the product
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WAEC Prep: Sketching a cubic from its factorised form
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Final Revision: The zeros of a polynomial and where its graph cuts the x-axis
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Quiz: The product of the roots of a cubic
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Practice: Finding the third root of a cubic when two are known
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Spot My Mistake: Showing the solution of an inequality on a number line
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Final Revision: The region of the plane satisfying a set of linear inequalities
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Worked Example: The number of arrangements of n different objects in a row
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