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Use the Probability Formula.
3/7
When calculating probability, we are comparing the number of favorable outcomes to the number of possible outcomes. To calculate the probability that a randomly chosen cube is red we will use the Probability Formula.
P=Favorable Outcomes/Possible Outcomes
Substitute values
a/b=.a /2./.b /2.
The probability of choosing a red cube is 37, which can also be written as 3:7.