document.write( "Question 825292: Find the number of 4-letter code words that can be formed from the letters of the word \"advance\".
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Algebra.Com's Answer #497203 by Edwin McCravy(20055) $\"\"$ $\"About$

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Find the number of 4-letter code words that can be formed from the letters of the word \"advance\".\r
\n" ); document.write( "\n" ); document.write( "1.using neither a.
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document.write( "Then we place four letters only from the set {d,v,n,c,e}\r\n" );
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document.write( "Answer:  P(5,4) = 5×4×3×2 = 120\r\n" );
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\n" ); document.write( "2.both a's
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document.write( "We choose the two positions {1st,2nd,3rd,4th} for the two a's \r\n" );
document.write( "That's C(4,2) ways.\r\n" );
document.write( "We place the other two letters P(5,2) ways.\r\n" );
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document.write( "Answer: C(4,2)P(5,2) = 6×20 = 120\r\n" );
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document.write( "Edwin

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