# How many combinations are possible: English alphabet A-Z and digits 0-9 in a set of 12. [closed]

How many combinations can be made from a 12 set string of letters and number that can be repeated and used more than once in any order. Ie- TD3GD3BK6K7T and would be different than T7K6KB3DG3DT or KKTT733DDGB6.

## closed as off-topic by choco_addicted, user228113, Chris Godsil, colormegone, Daniel W. FarlowApr 15 '16 at 3:21

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• caps and small letters or just caps? – MaxW Apr 15 '16 at 0:44
• $36^{12}$   – Kaster Apr 15 '16 at 0:44
• All caps I guess k=K. Thanks! – User122112 Apr 15 '16 at 0:48

Each character in the string can be any one of the (26+10) possible characters. So there are $36^{12}$ possible combinations.