Alphanumeric characters means any combination of letters and digits. Sometimes other special symbols are allowed, too - so alphanumeric may sometimes be understood to mean a combination of just about any type of symbols.
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it is 26
3.918208205 X 10^11 I think but I'm stupid so probably wrong
To write 3 alpha characters and 1 numeric character, you can choose any three letters from the alphabet (A-Z) and combine them with a single numeric digit (0-9). For example, you could write "ABC1" or "XYZ7".
A from z
26 lower case letters + 26 uppercase letters + 10 numerals = 62 characters 624 = 14776336