hard · GMAT Quant
A software firm assigns encrypted keys of length 4 to its users. Each key contains exactly one vowel from the set A, E, I, O, U and three consonants.
If characters may be repeated within a key and the vowel must be in the second position, what is the total number of unique keys available?
- 46,305
- 39,900
- 185,220
- 9,261
- 54,872
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