Can I please receive help with problem 1 a & b?

1. Solve the following counting problems. You do not need to simplify your answers. a. An organization with 28 members has a hiring committee, a training committee, and an outreach committee. Each committee must have exactly five members, and no member can be on more than one committee. How many ways can the positions on the three committees be filled? A candy store sells five varieties of truffles: dark chocolate, coconut caramel, peanut butter, raspberry, and hazelnut. How many ways can three truffles be chosen for a gift box if repetition is permitted? (Two gift boxes of truffles are considered different if they contain different truffles.}