Your school's talent show will feature 16 solo acts and 2 ensemble acts. the show will last 104 minutes. the 8 solo performers judged best will give a repeat performance at a second 64  minute show, which will also feature the 2 ensemble acts. each solo act lasts x minutes, and each ensemble act lasts y minutes. use this information to answer parts (a) and (b).

Assume that there is a 11% rate of disk drive failure in a year. a. if all your computer data is stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that during a year, you can avoid catastrophe with at least one working drive? b. if copies of all your computer data are stored on four independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive?