Answer:
1/3
Explanation:
total number of marbles: 2 + 3 + 1 = 6
number of red marbles = 2
The probability of an event is the number of desired outcomes divided by the total number of possible outcomes.
number desired outcomes: 2 since there are 2 red marbles, and either one is a desired outcome
total number of possible outcomes: 6
p(red) = 2/6 = 1/3
Answer: 1/3