1,334 prompts matching "Explain permutations and combinations back to me"
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Worked Example: The identity that A times its adjoint gives the determinant times the identity
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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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WAEC Prep: Reading the solution off the product of the inverse and the constants
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WAEC Prep: When the matrix method is worth the work for three unknowns
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Practice: Comparing the inverse method with elimination for three equations
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Quiz: Why mass stays the same wherever the body is taken
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WAEC Prep: The difference between a kilogram and a kilogram weight
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Worked Example: The weight of a body as mass times g
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Learn: Converting a weight given in kilogram-force into newtons
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Spot My Mistake: The greatest and the least resultant of two given forces
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WAEC Prep: The component of a force at thirty degrees to the horizontal
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Practice: Choosing the most convenient pair of directions to resolve along
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WAEC Prep: A table of components used to find a resultant
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Learn: A space diagram and a force diagram drawn side by side
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WAEC Prep: The triangle of forces used together with the cosine rule
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Spot My Mistake: Drawing the triangle of forces to scale to find an unknown force
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WAEC Prep: The two conditions for a rigid body to be in equilibrium
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Practice: Why the forces must sum to nought in two perpendicular directions
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Worked Example: Drawing the polygon of forces to scale
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