Directions: Determine whether a permutation or combination can be used. Then solve. 19. Three cards from a standard deck of 52 cards are chosen at random. What is the probability that all three cards chosen are hearts? 21. If the 3-digit security code on the back of a credit card using the digits 0-9 has no repeating digits, what is the probability that the code does not contain any numbers less than 52 20. Marissa has a $50, $20, $10, $5, and $1 bill in her wallet. She takes the bills out and randomly line them up. What is the probability that the first bill is greater than $52 22. There are twelve seniors and eight juniors on the prom committee. If two students are chosen at random to decide on decorations, what is the probability that one is a senior and one is a junior?