The probability that any four out of ten numbers 0,1,2,..., 9 can be arranged into an even four digit number It can be repeated

9X10X10X5=4500
So probability = 9x10x10x5 / (9x10x10x10x10) = 0.5
Note: even number of digits can only take 0, 2, 4, 6, 8, a total of 5
Thousand digits cannot be taken as 0, so there are nine ways to take them

RELATED INFORMATIONS

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