1,045 prompts matching "Why the probabilities in a distribution must sum to one"
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Quiz: The biconditional as two conditionals taken together
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Common Mistakes: Simplifying a compound statement using the laws
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Final Revision: A biconditional used in a mathematical definition
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Practice: Showing that a statement is a tautology
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Common Mistakes: Deciding between tautology, contradiction and contingency
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Final Revision: A longer statement tested for tautology
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Explain Back: The rule of syllogism
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Common Mistakes: The fallacy of denying the antecedent
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Explain Back: Arrangements restricted at the first letter
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Final Revision: Counting the arrangements of people in a queue
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Practice: Circular arrangements with two people together
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WAEC Prep: Beads on a necklace, and why the count halves
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Worked Example: Selections in which the order does not matter
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Quiz: Selecting from two groups at the same time
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Worked Example: Reading the coefficients of an expansion off Pascal's triangle
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Common Mistakes: The link between Pascal's triangle and combinations
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Final Revision: Expanding a bracket of the form a plus b over x
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Worked Example: Finding the fifth term of an expansion
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Quiz: Finding the term in x cubed
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Practice: Finding the term independent of x
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