IA Probability - Classical probability

1Classical probability

IA Probability - Classical probability 1 Classical probability IA Probability 1.2 Coun ting T o find probabilities, w e often need to c ount things. F or example, in our example ab o ve, w e had to coun t the n umber of elemen ts in B k . Example. A menu has 6 starters, 7 mains and 6 desserts. How many possible meals combinations are there? Clearly 6 × 7 × 6 = 252. Here we are using the fundamen tal rule of coun ting: Theorem (F undamental rule of coun ting) . Suppose we ha ve to make r m ultiple c hoices in sequence. There are m 1 p ossibilities for the first c hoice, m 2 p ossibilities for t

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