Suppose there are ten balls in an urn, four blue, four red, and two green. The balls are also numbered 1 to 10. You are asked to select an ordered sample of four balls without replacement. Let B ≥ 0 be the number of blue balls, R ≥ 0 be the number of red balls, and G ≥ 0 be the number of green balls in your sample. How many ways are there to select such a sample if exactly one of B, R, or G must be zero? numbered 1 to 10. You are asked to select an ordered sample of four balls without replacement. Let B ≥ 0 be the number of blue balls, R ≥ 0 be the number of red balls, and G ≥ 0 be the number of green balls in your sample. How many ways are there to select such a sample if exactly one of B, R, or G must be zero?
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