further probability

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Permutations and Combinations

combinations order does not matter

e.g. number of ways of selecting top 3 finishers in a race with 7 horses = 7C3

permutations - order matters

e.g. number of ways of selecting 1st, 2nd, 3rd place from race with 7 horses = 7P3

N.B. e.g. number of ways of all 7 horses finishing 1st-7th = n! -->= 7!

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