Question 20 Of 40 This question: 1 point(s) possible Consider a collection of envelopes consisting of 3 red envelopes, 1 blue envelope, 3 green envelopes, and 3 yellow envelopes. If three envelopes are selected at random, without replacement, determine the probability that they are all yellow envelopes. The probability that all of the envelopes are yellow is (Type an integer or a simplified fraction.)