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100.

Don't forget the 00 combination. Otherwise think of all numbers between 1 and 99 with all single digits have a zero in the first column (e.g. 1 = 01)

* * * * *

No, that is the number of permutations! As far as combinations are concerned, 23 is the same as 32.

So, you have 10*9/2 = 45 combinations.

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Q: How many 2 number combinations are there in the numbers 0 to 9?
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