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With 26 letters and 10 numerical digits, you have 36 characters altogether.

If characters may be repeated, then the total numnber of 3-character groups is

(36)^3 = 46,656.

If characters may not be repeated, then the number of groups is

(36 x 35 x 34) = 42,840 .

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Q: How many different combinations do 3 alphanumeric characters have?
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