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All of them, but it does depend on what operators are allowed.

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Q: How many of numbers from 1 to 9 can you create using only four 4'S?

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4!=4x3x2x1=24

How many numbers are there between 0000 and 9999?

24 ways

You may notice that card from a certain institution all have the same first four number. how many different credit card numbers can this institution create.

456,976,000

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The four digits can be used to produce infinitely many different numbers if repetition is permitted. Without repetition, there are 24 possible numbers. A lot more can be produced if the numbers are combined using binary oprations, fore example, 19 * 8/4 = 19*2 = 38.

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

3*3*2*1 = 18 of them.

any 4 from 7 is 35, in any order is 35 x 24 ie 840

Only four numbers:20233032

With base one million, you can create one nonillion different numbers; using the traditional decimal (base ten) system, you can form 100 thousand different numbers.

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