Use the number 123456 to form the number of four digits without repetition and the odd number is not adjacent

Four digit tens
And because odd numbers are not adjacent
There are three situations
One hundred or ten thousand or one thousand
Let's see a hundred is odd
So a32a32 = 36
Three odd numbers, two positions in order, multiplied by three even numbers, two positions in order
Ten thousand with one hundred = 36
A thousand is a32a32 = 36
So 36 * 3 = 108

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