1,045 prompts matching "Sum of an arithmetic series given the first and last term"
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Final Revision: Checking a factorisation by expanding it again
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Practice: A cubic with one real root and two complex ones
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Final Revision: Checking a root of a cubic by substitution
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Show All Working: Translating an English sentence into logical symbols
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Common Mistakes: Translating a symbolic statement back into English
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Learn: How many rows a truth table needs
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Common Mistakes: Comparing two statements by their truth tables
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Learn: The conditional statement, if p then q
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Show All Working: Why a conditional and its converse are not equivalent
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Final Revision: A conditional statement set in an everyday situation
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Practice: What logical equivalence means
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Show All Working: The distributive laws in logic
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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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WAEC Prep: A tautology used to justify a rule of algebra
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Common Mistakes: Deciding between tautology, contradiction and contingency
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Learn: What makes an argument valid
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Final Revision: An argument written in words and tested for validity
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Learn: Arranging five different books on a shelf
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Common Mistakes: Arranging objects when some must stay in a fixed order
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