1,206 prompts matching "Explaining why sum to infinity only works for |r| < 1"
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Practice: A diagonal matrix
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Learn: Deciding whether a stated matrix calculation is possible at all
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Practice: Evaluating AB minus BA
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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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Spot My Mistake: Finding the adjoint of a 3 by 3 matrix
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Learn: Swapping and negating the entries when inverting a 2 by 2 matrix
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Learn: The order of the steps in inverting a 3 by 3 matrix
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Practice: What a singular coefficient matrix says about the equations
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Learn: Inertia, and what mass actually measures
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Practice: The value of g used in Nigerian examination papers
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Practice: Limiting friction, and the greatest value it can reach
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Spot My Mistake: When Lami's theorem may be used, and when it may not
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Learn: The expectation of a discrete random variable
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Learn: Finding the coefficient of a stated power in an expansion
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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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Practice: The probability of exactly r events in a Poisson distribution
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Practice: The variance of a binomial distribution as npq
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