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Use the Probability Formula.
1/2
When calculating probability, you are comparing the number of favorable outcomes to the number of possible outcomes. To calculate the probability that a spinner would land on an orange section we will use the Probability Formula.
P=Favorable Outcomes/Possible Outcomes
Now we can look at the spinner and find the number of possible outcomes.
There are 4 sections on the spinner which is also the number of possible outcomes. Now we can find how many outcomes will result in the spinner landing on the orange part.
Out of these, there are 2 such outcomes which is also the number of favorable outcomes. Now we have enough information to calculate P(Orange).
Substitute values
a/b=.a /2./.b /2.
The probability of a spinner landing on an orange section is 12, which can also be written as 1:2.