urvi470 wrote:
chetan2u wrote:
MathRevolution wrote:
[GMAT math practice question]
Alice makes 2-digit codes using the 26 letters of the alphabet. Letters may be used repeatedly, and at least one vowel must be used. How many possible codes can she make?
A. 235
B. 256
C. 360
D. 625
E. 676
Alice makes 2-digit codes using the 26 letters of the alphabet. Letters may be used repeatedly, and at least one vowel must be used. How many possible codes can she make?
A. 235
B. 256
C. 360
D. 625
E. 676
Two ways...
First the better approach..
Total ways =26*25=650
Ways both are consonants = 21*20=420..
Atleast one vowel = 650-420=230
Second approach..
Ways both are vowels = 5*4=20
Ways one is consonant and one vowel = 21*5=105
These can be placed
...
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