351 prompts matching "A probability found by counting arrangements"
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Worked Example: Forming the determinant Dy by replacing the second column
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Learn: Solving two simultaneous equations by Cramer's rule
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WAEC Prep: The minor of an entry of a 3 by 3 matrix
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Explain Back: Finding the adjoint of a 2 by 2 matrix quickly
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WAEC Prep: The inverse of a 2 by 2 matrix with a fractional determinant
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WAEC Prep: The inverse of a 2 by 2 matrix as one over the determinant times the adjoint
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Learn: Swapping and negating the entries when inverting a 2 by 2 matrix
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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: How long the inverse of a 3 by 3 matrix takes, and how to shorten it
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WAEC Prep: Checking the determinant before attempting a 3 by 3 inverse
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WAEC Prep: The inverse of a 3 by 3 matrix from its adjoint and its determinant
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Learn: The order of the steps in inverting a 3 by 3 matrix
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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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Explain Back: Solving two simultaneous equations by multiplying by the inverse
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Worked Example: Checking the solution of three equations by substitution
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WAEC Prep: The forces on a body suspended by a single string
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Learn: A space diagram and a force diagram drawn side by side
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WAEC Prep: A rigid body held in equilibrium by four forces
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