The AND / OR Rules (Edexcel GCSE Maths): Quizzes

Two or more events

When both events must happen

When at least one event happens

$P(A) \times P(B)$

$P(A) + P(B)$

Events where one doesn't affect the other

Events that can't both happen at once

AND means multiply, OR means add

$0.1$

$0.35$

Break down into separate single events

AND with $\times$, OR with $+$