B.B2,Bs.B form a partition of: B....B partition B Important:B and B partition for any event B Partitioning an event A If B....B form a partition of,then (AB)....(AB) form a partition of A. 2 B B Bs We will see that this is very useful forfinding the probability of event A. This is because it is often easier to find the probability of small 'chunks'of A (the partitioned sections)than tdind the whole probability of A at once.The partition idea shows us how to add the probabilities of these chunks together:see later 9125 9 / 25 . form a partition of A. We will see that this is very useful for finding the probability of event A. This is because it is often easier to find the probability of small ‘chunks’ of A (the partitioned sections) than to find the whole probability of A at once. The partition idea shows us how to add the probabilities of these chunks together: see later