1,199 prompts matching "how many ways can a committee of 4 be chosen from 10 people"
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WAEC Prep: Writing the transpose of a matrix by turning rows into columns
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Practice: The transpose of a 2 by 3 matrix
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WAEC Prep: The identity matrix of order three
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Quiz: The zero matrix, and how it differs from nought in arithmetic
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WAEC Prep: The order of a matrix formed from a table of data
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WAEC Prep: Reading the order of a matrix as rows by columns
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WAEC Prep: The determinant of a matrix with a row of noughts
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WAEC Prep: The determinant of the identity matrix
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WAEC Prep: The determinant of a 2 by 2 matrix as ad minus bc
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Worked Example: What a determinant of nought means for a 2 by 2 matrix
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Learn: The effect on a determinant of swapping two rows
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WAEC Prep: The determinant of a 3 by 3 matrix with two equal rows
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Practice: The sign pattern of the cofactors in a 3 by 3 determinant
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Worked Example: Evaluating a 3 by 3 determinant by the rule of Sarrus
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WAEC Prep: The determinant Dz in a system of three unknowns
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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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WAEC Prep: The minor of an entry of a 3 by 3 matrix
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Practice: Turning a minor into a cofactor with the sign rule
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Spot My Mistake: Checking cofactors by expanding the determinant along a second row
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