1,045 prompts matching "Structured question: combination problem with 'at least' condition"
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Common Mistakes: Deciding between tautology, contradiction and contingency
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Worked Example: Premises and conclusion
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Practice: Modus tollens
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Explain Back: The rule of syllogism
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Show All Working: The fallacy of affirming the consequent
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Common Mistakes: The fallacy of denying the antecedent
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Worked Example: Arranging r of n objects in a line
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Common Mistakes: Arranging objects when some must stay in a fixed order
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Worked Example: The number of ways n people sit round a round table
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Common Mistakes: The number of ways of dividing a class into groups
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Practice: The probability of drawing one ball of each colour
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Common Mistakes: A probability found by counting arrangements
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Worked Example: Reading the coefficients of an expansion off Pascal's triangle
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Practice: The symmetry of a row of Pascal's triangle
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Explain Back: The sum of the entries in a row of Pascal's triangle
I have just studied the sum of the entries in a row of Pascal's triangle in my SS2 Further
Show All Working: The binomial coefficients written as n choose r
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Worked Example: Finding the fifth term of an expansion
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Practice: Finding the term independent of x
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Explain Back: Finding the coefficient of a named term
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Show All Working: The general term when the bracket contains a fraction
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