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Given that 'ten different numbers' is all of them.. then including 0000, there will naturally be 10,000 combinations.

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" ... there will naturally be 10,000" only if you don't know the difference between permutations and combinations.

Orders do not affect combinations so that 1234 is the same as 4321, 1432, etc. The number of 4-digit combinationsis (10*9*8*7)/(4*3*2*1) = 210

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Q: How many four number combinations can be made from ten different numbers?
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