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Q: How many different 3 digit combinations can be made using numbers one through nine?

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Number of 7 digit combinations out of the 10 one-digit numbers = 120.

9^9 = 387420489 different digit combinations.

66

15

10,000

2304

56 combinations. :)

10!/3! = 604800 different combinations.

9!/6!, if the six different orders of any 3 digits are considered distinct combinations.

This question needs clarificatioh. There are 4 one digit number combinations, 16 two digit combinations, ... 4 raised to the n power for n digit combinations.

If there are no restrictions on duplicated numbers or other patterns of numbers then there are 10 ways of selecting the first digit and also 10 ways of selecting the second digit. The number of combinations is therefore 10 x 10 = 100.

There are 360 of them.

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