In the ten natural numbers of 0.9, take any four different numbers to find the probability of forming a four digit even number

Because it's an even number, the last digit can only be 0, 2, 4, 6, 8. When zero is selected, the first thousand digits can be 9, the hundred digits can be 8, and the ten digits can only be 7, so the total number is 9 * 8 * 7. When it's 2, 4, 6, 8, the thousand digits can only be 8 (because 0 needs to be removed), the hundred digits can be 8, and the ten digits can only be 7. The total number is 8 * 8 * 7 *

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