Hello,
This is a combination.
You "take" 5 elements among 20 elements (the houses).
Combination - Wikipedia, the free encyclopedia
There are two small towns, Greenville and Yellowville. Greenville contains 20 houses and Yellowville contains 15 houses. The state safety inspector is asked to randomly inspect 5 houses in Greenville and 7 houses in Yellowville. In how many ways can this be done (Hint: this is not a permutation)?
Hello,
This is a combination.
You "take" 5 elements among 20 elements (the houses).
Combination - Wikipedia, the free encyclopedia