1,334 prompts matching "Logical reasoning with 'and' versus 'or' in sets"
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Quiz: The zero matrix as the identity for matrix addition
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Spot My Mistake: Squaring a 2 by 2 matrix
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Spot My Mistake: Multiplying a 3 by 3 matrix by a 3 by 1 column
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Learn: The distributive law for a scalar over a sum of matrices
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Quiz: Multiplying a matrix by minus one
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Spot My Mistake: Orders that make a product possible one way round but not the other
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WAEC Prep: The transpose of a column vector
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WAEC Prep: The identity matrix of order three
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WAEC Prep: The order of a matrix formed from a table of data
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Learn: Deciding whether a stated matrix calculation is possible at all
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Quiz: Finding an unknown entry from a stated matrix equation
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Learn: The effect on a determinant of swapping two rows
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Learn: Solving two simultaneous equations by Cramer's rule
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Spot My Mistake: Checking a Cramer's rule solution by substituting back
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WAEC Prep: The cofactor of a corner entry
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WAEC Prep: Why the cofactor signs alternate
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Spot My Mistake: Finding the adjoint of a 3 by 3 matrix
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Quiz: Checking an inverse by multiplying to get the identity
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Quiz: Checking a 3 by 3 inverse by multiplication
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WAEC Prep: When the matrix method is worth the work for three unknowns
Act as my WAEC Further Mathematics coach. I am in SS 3. Take me through when the matrix me