"one third" is not an event and so cannot have complement nor a probability.
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The complement of an event occurring is that it does not occur.
22.5
With the information that is available from the question, it is impossible.
The probability of no rain is the complement of the probability of rain. If the probability of rain is 0.99, then the probability of no rain is calculated as 1 - 0.99, which equals 0.01. Therefore, there is a 1% chance of no rain.
two out of 6 or one third