The events A A\,A and B B\,B are such that P(A)=310\displaystyle P(A) = \frac{3}{10}P(A)=103, P(A∩B)=325\displaystyle P(A \cap B) = \frac{3}{25}P(A∩B)=253, P(A∣B)=25\displaystyle P(A|B) = \frac{2}{5}P(A∣B)=52. Find
P(B)P(B)P(B)
P(A∪B)P(A \cup B)P(A∪B)
P(B∣A′)P(B|A')P(B∣A′)
29 exam-style questions on Edexcel A Level Maths 2.4 Probability Formulae. Each one has a worked solution and a mark scheme showing where the marks go.