1,310 prompts matching "Practice: An operation that is not commutative, with a counter-example"
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Spot My Mistake: Checking a Cramer's rule solution by substituting back
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Quiz: Arranging the equations in standard form before applying Cramer's rule
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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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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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Practice: The parallelogram law of forces
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Spot My Mistake: Compounding three forces acting at one point
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Practice: Choosing the most convenient pair of directions to resolve along
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Quiz: The magnitude of the resultant of several coplanar forces
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Practice: Why the forces must sum to nought in two perpendicular directions
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Quiz: A rod resting against a wall, and the concurrence of its three forces
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Practice: Resolving three forces in two perpendicular directions
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Spot My Mistake: Finding two unknown tensions from three forces in equilibrium
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Spot My Mistake: The probability of exactly r successes in n trials
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Practice: The probability of at least one success
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Worked Example: The probability of no events at all in a Poisson distribution
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Quiz: The area under the normal curve, and what it represents
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Worked Example: The continuity correction when approximating a discrete distribution
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Spot My Mistake: Drawing a vector as a directed line segment
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