Question 425634
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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)