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I'm having trouble with probabilities can someone please help?

Marvin lives in Stormwind City and works as an engineer in the city of Ironforge. In the morning, he has 3 transportation options (teleport, ride a dragon, or walk) to work, and in the evening he has the same 3 choices for his trip home.
If Marvin randomly chooses his method of travel in the morning and in the evening, what is the probability that he teleports at least once per day?

Respuesta :

he has 1/3 of a whole chance of getting his way of transportation, we have three ways teleport, ride a dragon, and walk, we put all of our options on the bottom and we pick the amount we need to the top and since we only want one of the three it's 1/3, 3/9, 4/12 or 5/15 and so forth

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