605 prompts matching "When to use permutations versus combinations"
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Worked Example: Which form of the sum formula to use when r is less than one
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Spot My Mistake: Simplifying the denominator once the conjugate has been used
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Common Mistakes: Rationalising when both terms of the denominator are surds
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Worked Example: Converting a logarithm to base ten so that tables can be used
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Show All Working: The sum to infinity of a geometric progression, and when it exists
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Rationalising the denominator when it's a surd minus a surd
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Applying the sum to infinity formula when the ratio lies between minus one and one
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Evaluating (1/2)^-3 without a calculator
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Explaining why sum to infinity only works for |r| < 1
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Substituting values into an algebraic expression
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Quiz: Writing a recurring decimal as a fraction to show it is rational
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Quiz: Reducing two surds to the same root in order to compare them
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Spot My Mistake: Why root 8 and root 2 turn out to be similar
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Learn: Simplifying root 72 into its simplest form
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Learn: Why a surd is never left in the denominator
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Quiz: Rationalising a denominator of the form one over root 3
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Spot My Mistake: Rationalising and then cancelling a common factor
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WAEC Prep: Rationalising a denominator inside a larger expression
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Quiz: Rationalising a denominator of the form one over 2 plus root 3
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Worked Example: Squaring both sides safely when solving a surd equation
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