351 prompts matching "A probability found by counting arrangements"
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Common Mistakes: A binary operation defined by arithmetic modulo n
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Learn: Simplifying a surd by extracting the largest perfect square
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Quiz: Solving an index equation by writing both sides to the same base
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Show All Working: Solving a quadratic by completing the square
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Final Revision: Solving a disguised quadratic by substitution
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Final Revision: Checking a symmetric-function answer by solving the equation outright
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Worked Example: Evaluating a polynomial by substitution
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Show All Working: Solving a cubic equation by factorisation
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Final Revision: Checking that the roots found satisfy the original equation
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Learn: Solving a linear inequality, and reversing the sign on dividing by a negative
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Worked Example: Solving a quadratic inequality by sketching the parabola
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Worked Example: The number of arrangements of n different objects in a row
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Quiz: The number of arrangements of r objects chosen from n
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Practice: Arrangements when some of the objects are identical
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Explain Back: Arrangements in which two particular objects must stay together
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Common Mistakes: Arrangements restricted at the first or the last place
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Final Revision: Counting the number plates or codes that can be formed under a rule
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Final Revision: Proving an identity by working on one side only
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WAEC Prep: Solving an equation by first applying a double angle formula
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Show All Working: Solving a cos x plus b sin x equals c by the R method
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