Complement Rule in Probability | Why one minus P(A) works — and why it’s faster
Автор: A-Level Mathematics
Загружено: 2025-09-17
Просмотров: 132
Описание:
This video explains the complement rule: the probability of “not A” equals one minus the probability of A. We start with an eight-sided spinner, where finding the chance of landing on numbers two through eight is quicker by flipping to “not one.” Then we extend to rolling two dice, showing how calculating “at least three” becomes easy once you spot the single “bad” outcome. Both examples highlight how complements cut down unnecessary work.
Relevant courses: US Algebra 2 & Precalculus • IB AA/AI (SL/HL) • Cambridge AS & A Level • Australia HSC/VCE/QCE • India CBSE 11–12 & JEE prep
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