4 Character = 26X26X26X26 = 26^4
+
5 Character = 26X26X26X26X26= 26^5
=
26^4(26+1)
= 27(26^4)
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GmatPrep1?? (4 letter or 5 letter)
Source: Beat The GMAT — Problem Solving |
this is a permutation problem.
26 letters
4 letter code - 26*26*26*26 = 26^4
5 letter code - 26*26*26*26*26 = 26^5
total permutations = 26^4 + 26^5 = 26^4 (1+26)
=> (27) 26^4
Hope its clear.
26 letters
4 letter code - 26*26*26*26 = 26^4
5 letter code - 26*26*26*26*26 = 26^5
total permutations = 26^4 + 26^5 = 26^4 (1+26)
=> (27) 26^4
Hope its clear.
