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To be a four digit number the highest value digit (the thousabdth's position) cannot be zero because if it is then it ceases to be a four digit number. Hence the thousandth position digits can be 1 through 9 both inclusive. The other three digits can be 0 through 9 both inclusive. Therefore the number of four digit numbers you can make is

9 x 10 x 10 x 10 = 9000. To enumerate them all a simple computer program in BASIC or C can easily be written.

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12y ago
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Q: What are the four digit numbers you can make out of 0-9?
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