755 prompts matching "Arranging r of n objects in a line"
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Coordinate geometry combined with simultaneous equations
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Distinguishing gradient sign: positive, negative, zero, undefined
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Solving a word problem using simultaneous equations
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Common sign errors in algebraic manipulation
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Worked Example: Why the square root of a non-square whole number is irrational
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Show All Working: Deciding whether two given surds are equal without a calculator
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Show All Working: Simplifying a surd expression that contains brackets
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Show All Working: Checking a rationalised answer by decimal approximation
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Show All Working: A conjugate where the surd term comes first
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Show All Working: Finding a and b when a plus b root 2 equals a given surd
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Show All Working: Evaluating a repeated operation such as a*(b*c)
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Show All Working: Showing a set is not closed by a single counter-example
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Show All Working: An operation that is associative but not commutative
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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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Show All Working: Simplifying an expression with letters and indices
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Show All Working: Simplifying an expression that mixes the index types
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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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Worked Example: The law for the logarithm of a quotient
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