Easy questions, easy points.

1. to solve an equation that used addition, undo with
2.
to solve an equation that uses subtraction, undo with
3. to solve an equation that uses multiplication, undo with
4. to solve an equation that uses division, undo with

use the words addition, subtraction, division or multiplication to full in the boxes above. one word per box

Suppose you just purchased a digital music player and have put 8 tracks on it. after listening to them you decide that you like 4 of the songs. with the random feature on your player, each of the 8 songs is played once in random order. find the probability that among the first two songs played (a) you like both of them. would this be unusual? (b) you like neither of them. (c) you like exactly one of them. (d) redo () if a song can be replayed before all 8 songs are played.