given that set B is ccontained in a set A, show that the probability of A is greater than or equal to that of B
Cardinality? That is not the notation I know.to represent the number of elements in set A,
Let your be the unit disk, let A be some disk contained in , now what does your notation mean?and that . Even if they are infinite, the same logic holds if you were to draw a Venn Diagram of the situation.