Hello there!
The probability of picking a red marble out of a bag of 3 green, 5 blue, 2 red, and 6 yellow marbles is 2/14.
There are 14 marbles that we don't want and 2 marbles that we want. That's why it would be 2/14.
Simply 2/14 to 1/7.
Therefore, the probability of picking a red marble is 1/7.