PHL145H5 Chapter 13: Chapter 13
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Eg/ rolling a fair dice with 1, 2, 3, 4, 5, 6: pr (3) = 1/6, pr (even) = 3/6 = . Are numbers used to measure the likelihood of something: something is 50/50 when it is equally likely. They are in between 0-1 where 0 = no way and 1 = for sure : can"t have probabilities that are 1. 3 or -2. Pr = probability and within the brackets is an abbreviation of whatever it is that you are looking at. Absolutely certain outcomes: rule 1: if something is certain to happen. Eg/ drawing a ball from the above urn that is red or green: rule 2: if something is certain not to happen. Disjunctions with incompatible disjuncts: disjunction: says an either/or statement (one or both can be true) eg/ either i roll a 5 or a 6 eg/ either the butler did it or the defence is lying. Disjuncts: the simpler sentences of the disjunction.
