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anjaligeorge1
- Senior | Next Rank: 100 Posts
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If it is a 4 letter code:
26 x 26 x 26 x 26 (Since the letters don’t have to be distinct. You are selecting from the same pool of 26 each time).
Similarly, for a 5 letter code:
26 x 26 x 26 x 26 x 26
=> Total = 26^5 + 26^4
= 26^4 (26 + 1) 26^4 is common
= 26^4(27)
