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I assume you mean how many 4-digit numbers can be made from a set such as {A,A, B, C} where A, B and C are single digits. There are 12 such numbers.

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Q: How many numbers can be made from four digits when two are the same?

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45

There are 24.

24

3*3*2*1 = 18

10,000

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45

94

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There are 24.

3*3*2*1 = 18

24

How many license plates can be made using either two uppercase English letters followed by four digits or two digits followed by four uppercase English letters?

how many numbers exactly have 4 digits ? 8900, 8999, 9000, 9999

10,000

If you're asking for 4 digit numbers where all four digits are odd, then the lowest number possible is 1111, and the highest is 9999. You only have 5 digits to work with. The answer is: 54 - 53 = 625 - 125 = 500.Subtract the 5 cubed for the numbers less than 1111, which are not four digits.

you take the four digits and multiply 4 by 4 you get 16 digits

If the digits are all different then 18. Otherwise, 192.