help with 18-20 please

hree heads? 8. Becky flips three coins and counts how may tails she gets. What is the probability that she flips exactly 19. Barry volunteers at a charity walk to make lunches for all the other volunteers. In each bag he puts: one of two sandwiches ( peanut butter and jelly or turkey and cheese) , one of three chips, and one of two fruits ( an apple or an orange) . Assuming that each choice is equally likely, . What is the probability that a bag holds a peanut butter and jelly sandwich and an apple? . What is the probability that a bag holds a turkey and cheese sandwich and an orange? 20. If gumballs come in 10 different colors, what is the chance of getting a blue gumball? Assume that blue, is one of the colors of the gumballs