It depends if you are allowed to repeat letters or not.
WIth repetition allowed:
26 choices for 2nd letter
26 choices for 3rd letter
26 choices for 4th letter
Total = 26 x 26 x 26
With no repetition:
25 choices for 2nd letter
24 choices for 3rd letter
23 choices for 4th letter
Total = 25 x 24 x 23
26^3
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It depends if you are allowed to repeat letters or not.
WIth repetition allowed:
26 choices for 2nd letter
26 choices for 3rd letter
26 choices for 4th letter
Total = 26 x 26 x 26
With no repetition:
25 choices for 2nd letter
24 choices for 3rd letter
23 choices for 4th letter
Total = 25 x 24 x 23
26^3