Ask a permutation question: how many six digit numbers can be made up of 3 odd numbers and 3 even numbers from the 10 numbers 0 to 9?
(1) No 0
C (5,3) × C (4,3) × a (6,6) = 28800
(2) Choose 0
C (5,3) × C (4,2) × C (5,1) × a (5,5) = 36000
A total of six digits without repetition: 28800 + 36000 = 64800
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