document.write( "Question 862518: An environmental agency will randomly select four houses from a block containing twenty houses and test them for lead paint. In how many ways can the selections be made? \n" ); document.write( "
Algebra.Com's Answer #519729 by Fombitz(32388)\"\" \"About 
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First house they have 20 choices.
\n" ); document.write( "Second house 19 choices.
\n" ); document.write( "Third house 18 choices.
\n" ); document.write( "Fourth house 17 choices.
\n" ); document.write( "\"N=20%2A19%2A18%2A17=116280\"
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