699 prompts matching "how many ways can a president and secretary be chosen from 8 people"
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Show All Working: Checking a rationalised answer by decimal approximation
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Spot My Mistake: Simplifying the denominator once the conjugate has been used
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Show All Working: A conjugate where the surd term comes first
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WAEC Prep: Equating the rational and the irrational parts of an equation
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Show All Working: Evaluating a repeated operation such as a*(b*c)
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Quiz: Testing the odd numbers for closure under addition
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Show All Working: Showing a set is not closed by a single counter-example
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Final Revision: Why closure is checked before any other property
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Learn: What it means for an operation to be commutative
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Show All Working: An operation that is associative but not commutative
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Quiz: Left distributivity and right distributivity
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Show All Working: Using distributivity to simplify an expression
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Show All Working: An element with no inverse under a given operation
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Learn: Reading index notation, the base and the exponent
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Learn: Why any non-zero number to the power nought is one
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Quiz: A negative index on a fraction, and turning it upside down
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Show All Working: Simplifying an expression that mixes the index types
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Quiz: An indicial equation that becomes a quadratic in a power
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Show All Working: A word problem that leads to an indicial equation
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Show All Working: The common logarithm, to base ten
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