175,760,000.
10,000 x 26^3.
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3!*3!=36For example, if you want to use the alphabets a,b,c and three digits 1,2,3 you can make the following 36 different passwords (3 letters followed by 3 digits)abc123abc132abc231abc213abc312abc321acb123acb132acb231acb213acb312acb321bca123bca132bca231bca213bca312bca321bac123bac132bac231bac213bac312bac321cab123cab132cab231cab213cab312cab321cba123cba132cab231cab213cab312cab321
11,232,000
Allowing repetitions, there are 9 combinations. Without repeated digits, there is only one combination of 3 digits from 3.
You Can Create 999 Number combinations
The answer is 26*26*26*10*10*10 = 17,576,000