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Assuming that zero cannot be used for the first digit then this can be selected from numbers 1 - 9 (9 choices), and the 2nd, 3rd and 4th digits from 0 - 9 (10 choices). The total number of different ways is : 9 x 10 x 10 x 10 = 9000.
You can write a ratio three ways. Ex: 2/9, 2 to 9 or 2:9
2/3, 4/6
A can be 0 or 9.
How many different ways can we arrange 9 objects taken 3 at a time?