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Posted by on Monday, May 3, 2010 at 7:37pm.

How many 3 letter arrangements can you make while making the first and the third letter one of the 21 constants and the middle letter one of the 5 vowels {a,e,i,o,u} . {two such arrangments to use are KOM and XAX?

  • math - , Monday, May 3, 2010 at 9:48pm

    From your example I can see that repetition is allowed so
    21*5*21 = ...

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