1,283 prompts matching "Union and intersection of two number sets"
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Practice: A diagonal matrix
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Practice: The condition on the orders for a product to exist
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Learn: Deciding whether a stated matrix calculation is possible at all
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WAEC Prep: Evaluating A squared minus 2A
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Practice: Evaluating AB minus BA
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Quiz: Finding an unknown entry from a stated matrix equation
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WAEC Prep: When Cramer's rule is quicker than elimination
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WAEC Prep: Cramer's rule applied to a pair with fractional coefficients
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Spot My Mistake: Forming the determinant Dx by replacing the first column
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WAEC Prep: What Cramer's rule gives when the system is inconsistent
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WAEC Prep: Setting out Cramer's rule for three simultaneous equations
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Spot My Mistake: Checking a Cramer's rule solution by substituting back
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Quiz: Checking an inverse by multiplying to get the identity
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Practice: Why a 2 by 2 matrix with determinant nought cannot be inverted
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WAEC Prep: Checking the determinant before attempting a 3 by 3 inverse
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Quiz: Checking a 3 by 3 inverse by multiplication
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WAEC Prep: Simultaneous equations with fractional coefficients solved by matrix
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Spot My Mistake: Why the inverse must be applied on the correct side
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Practice: What a singular coefficient matrix says about the equations
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WAEC Prep: A three-unknown system arising from a word problem
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