Can someone please help me with this whole page ? Please it needs to be done ASAP!

What signals you that factoring by grouping is the best method to use when factoring a problem?

Can someone me out here and the tell me the greatest common factor

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.