Past exam of the year 1 of the computer science course of the University of Oxford / 2015 / Discrete mathematics, continuous mathematics, and probability / 7 / a / i

A partition of a sample space is a finite or countable family of nonempty events such thatThus exactly one event in the family occurs in each outcome. To use ordinary event-conditioned conditional expectations, one usually assumes $\mathbb{P}(B_i)>0$; any zero-probability blocks can instead be omitted from the expectation formula.