The answer depends on how many numbers on the spinner, and their distribution. Without that information, it is not possible to answer the question.
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The answer depends on the shape of the spinner and the numbers on it.
1/6
When a fair die is thrown the probability that a prime number will occur is 2:1
The probability of eventually throwing a prime number is 1. On a single throw, of a fair die, the probability is 1/2.
33%