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6

for example, 123

123

132

321

213

231

312

* * * * *

WRONG.

Those are permutations, not combinations.

There are 8 possible combinations:

123

12

13

23

1

2

3

and finally, the null combination.

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Q: How many combinations of 3 numbers are there?
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How many combinations with 3 numbers?

9


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