document.write( "Question 1022864: How many four-letter codes can we make using only vowels, a, e, i, o, or u?
\n" ); document.write( "N = possible codes \n" ); document.write( "

Algebra.Com's Answer #639783 by Fombitz(32388) $\"\"$ $\"About$

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Assuming repetition is allowed,
\n" ); document.write( " $\"N=5%2A5%2A5%2A5=625\"$
\n" ); document.write( "Assuming no repetition is allowed,
\n" ); document.write( " $\"N=5%2A4%2A3%2A2=120\"$ \r
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