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Use the Probability Formula.
1/3
When calculating a probability, we are comparing the number of favorable outcomes to the number of possible outcomes. To calculate the probability of obtaining a number less than 3 when rolling the number cube, we will use the Probability Formula.
P=Favorable Outcomes/Possible Outcomes
Substitute values
a/b=.a /2./.b /2.
The probability of obtaining a number less than 3 is 13, which can also be written as 1:3.