There are 20 questions if peter gets a 80% how many questions did he get correct

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

Ineed me i stuck and i don’t want to get it wrong

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.