SOLUTION: 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?

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?
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
First house they have 20 choices.
Second house 19 choices.
Third house 18 choices.
Fourth house 17 choices.

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