Some of the items on a restaurant menu are vegetarian and some of them are gluten free. There are 29 items on the menu. 21 of the items are not vegetarian and 7 of these are also not gluten free. 6 of the items are vegetarian but not gluten free. a) If a randomly chosen item is gluten free, what is the probability that it is also vegetarian? b) If a randomly chosen item is vegetarian, what is the probability that it is also gluten free? Give each answer as a fraction in its simplest form.​