ANSWERS: 1
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This is: (number of ways of choosing one car of each color) divided by (number of ways of choosing three cars) Which is 5C1 * 4C1 * 3C1 / 12C3 12C3 is a binomial coefficient, "12 choose 3" and is calculated as (12*11*10)/(3*2*1), same number of numbers on the top as on the bottom.
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