That depends what rules you use, to choose a number randomly.
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The probability for dice depends on how many. For a die, it is 1/3.
the probabilty is 4 out of 6 our 2/3
4 over/out of 6
4:6 reduces to 2:3
The probability of rolling a number greater than 4 is 2/6, that is, 1/3. For the probability of pulling out a red marble, more data has to be known. Just put the number of red marbles in the numerator, the total number of marbles in the denominator. Finally, multiply the two probabilities.