# Statistics

4. An environmental agency will randomly select 4 houses from a block containing 25 houses for a radon check.
a) How many total selections are possible?
b) How many permutations are possible?

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3. ๐ 27
1. a. C(25,4) = P(25,4)/4!
b. P(25,4) = 25*24*23*22

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posted by Steve

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