What you’ll learn4 learning objectivesChoose one objective for a focused lesson, or study the complete topic.5.3.1Permutations and combinations• evaluate probabilities in simple cases by means of enumeration of equiprobable elementary events, or by calculation using permutations or combinations e.g. the total score when two fair dice are thrown. e.g. drawing balls at random from a bag containing balls of different colours.Syllabus objective5.3.2Probability rules• use addition and multiplication of probabilities, as appropriate, in simple cases Explicit use of the general formula AB AB ABPP PP,+ -= +^^ ^^hh hh is not required.Syllabus objective5.3.3Exclusive and independent events• understand the meaning of exclusive and independent events, including determination of whether events A and B are independent by comparing the values of ABP +^h and ABPP #^^ hhSyllabus objective5.3.4Elementary probability• calculate and use conditional probabilities in simple cases. e.g. situations that can be represented by a sample space of equiprobable elementary events, or a tree diagram. The use of AB B ABP P P +=^ ^ ^h h h may be required in simple cases.Syllabus objective