Going To New Year PartiesDiscrete Mathematics Level 2
To celebrate the New Year, I have received invitations to 5 parties hosted by Andrew, Betty, Chandra, Dela and Eugene. I plan to attend all 5 parties, at different points in time. I want to go to Andrew's party (anytime) before Betty's party, and I want to go to Eugene's party last, as he has a huge swimming pool to jump into. How many different ways are there for me to attend these parties?