Hello may I please have help with these? Thank you

9. A certain ice cream parlor offers 15 flavor of ice cream. You want an ice cream cone with three scoops of ice cream, all different flavors. a. In how many ways can you choose a cone if it matters which flavor is on the bottom, which flavor is in the middle, and which flavor is on top? b. In how many ways can you choose a cone if the order of the flavors doesn't matter? 10. A committee consists of ten women and eight men. Three committee members will be chosen as officers. a. How many different choices are possible? b. How many different choices are possible if all the officers are to be women? c. What is the probability that all of the officers are women