I'm stuck in this question, could someone give me a hand?
Question 9:
Let $$A = (1,2,3,4)$$ and $$Z = (1,2,3,4,5,6,7,8,9,10)$$, if a subset B of Z is selected by chance calculate the probability of:
a) $$P (B⊂A)$$ B is a proper subset of A
b) $$P (A∩B = Ø)$$ A intersection B =empty set...