628
5. Evaluate Expressions
a) 9!/4! = (9 x 8 x 7 x 6 x 5 x 4!) / (4!)
= (9 x 8 x 7 x 6 x 5 x 4!) / (4!)
= 15120
b) (52-47)! = 5!
= 5 x 4 x 3 x 2 x 1
=120
6. Combinations vs. Permutations
Combination
Permutation
Number of ways to select 'r' items/objects from a given number of 'n' items
Number of ways to arrange 'r' items/objects from a given number 'n' items
The order of selecting items is not of interest but repetition is allowed
The order of items is of interest and also allows for repetition
Formula given as
Formula given as
For example,...
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