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Answers for “如何使用容斥原理在有限计数示例中求解交集概率?”

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A probability must be a number between 0 and 1 inclusive. A percent value, such as 10, represents a whole number and falls outside this valid range.

Conditions: The value is intended to represent a probability.

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It is recommended to delay fraction simplification because all terms in the equation share a common denominator. Keeping the fractions unsimplified makes the addition and subtraction steps much easier and less prone to arithmetic errors.

Conditions: All probability terms in the equation share the same denominator.