Conditional Probability Problem Help!

#1
Hey guys, I got this question as a practice problem. I believe that it's a conditional probability where I should find the probability of NOT selecting one-half gallon carton.
Can someone confirm if there is a typo in this question/is it solvable? Because it doesn't state the sample size to choose from.


Thanks in advance for your help! :)
 
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#2
You have the right idea. We would find the probability of not selecting the half gallons. And do something with this result to get the probability of selecting at least one half gallon. However, this idea is not conditional probability.