Hi

permutations and combinations for 3 of 4 digits: 3,5,7,9

permutations = 4P3 = 4! = 24

combinations = 4C3 = 4!/3! = 4 

Note: Combinations (order not important) are: 

(3,5,7) 

(3,5,9) 

(3,7,9) & 

(5,7,9)

 

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