John has a bag of marbles that contains 12 red marbles, 20 green marbles, and 17 blue marbles. problem 1) what is the probability that he will notget red? need now this is due tomorrow!

12 red marbles
20 green marbles
17 blue marbles
Total amount: 39 marbles

39 (total) - 12 (red) = 27.

John has a probability of 27/39 that he will not pick a red marble out of the bag.
If you want to simplify your fraction by dividing both numbers by 3 to make it even more accurate, an even better answer would be 9/13.

(so all you do is divide 27/3 and divide 39/3 aswell which gives you 9 and 13.)