Every year on February 14th at 8:00 A.M, there will be 38 pink roses, 28 red roses and 18 sky blue roses available in a florist shop at the Centre Point Mall. For this coming February 14th, Justin would like to get 8 roses from this florist shop at 8:00 A.M for her mother's 98th birthday. What is the probability that he will get a. At least 5 pink roses? b. at least 3 pink roses and at least 3 red roses? c. At least 3 pink roses, and at least 2 red roses and at least 2 sky blue roses?