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9999 + 1

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That is so wrong!

There are 10*9*8*7/(4*3*2*1) = 210 combinations of 4 numbers from the set of ten 1-digit numbers, 0 1, 2, ... 9

When considering combinations, 1234 is the same as 2314 or 4123 etc.

Actually...

4 numbers to be arranged with ten different possibilities each will give a total of 10^4 combinations, or 10,000.

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12y ago

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Q: How many different combinations of four numbers are there?
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