755 prompts matching "Why the probabilities in a distribution must sum to one"
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Deciding whether a geometric series converges
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Word problem: total distance from a bouncing ball
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Sum of the first n odd numbers
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Finding a sequence's sum between two term numbers
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Worked Example: Why the square root of a non-square whole number is irrational
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Spot My Mistake: The decimal expansion of an irrational number, and why it never repeats
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Common Mistakes: Why a rational number added to an irrational one stays irrational
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Explain Back: Why 2 root 3 and 5 root 3 count as similar surds
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Spot My Mistake: Why root 8 and root 2 turn out to be similar
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Final Revision: Why brackets matter when an operation is not associative
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Learn: The formula for the sum of the first n terms of an arithmetic progression
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Worked Example: The alternative sum formula that uses the last term
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Quiz: The sum of the first fifty natural numbers
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Spot My Mistake: The sum of an arithmetic progression with a negative common difference
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Learn: The formula for the sum of the first n terms of a geometric progression
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Quiz: The sum of the first six terms of a given geometric progression
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IGCSE Additional Maths Y10: Why a modulus graph never dips below the x-axis — Exam Technique
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IGCSE Additional Maths Y10: The restriction that the argument of a logarithm must be positive — Common Mistakes
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Fractional indices with numerator above 1
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Rewriting different bases as the same base
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