if you cannot repeat the letters hmm, let's find how many for 4 letters there are 4! or 4*3*2*1=24 that's how many ways there are to arrange a,b,c, d now we can multiply it by 4 because there are 4 choices for the last place (e is not included0 24*4=56 answer is 56 different arrangements
It shouldn't be too hard, I've been taking my practice test all day today and yesterday night and I believe i'm going to do good today on my test, just study hard and take the practice test
