Answer:
1 : 4
Step-by-step explanation:
You want the odds in favor of an event with a probability of 1/5.
The odds in favor of an event with probability p are ...
p : (1 -p)
Here, that is ...
1/5 : (1 -1/5) = (1/5) : (4/5) = 1 : 4
The odds in favor of choosing a red marble are 1 : 4.
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