thanks... im having trouble with this one too.. funny how i get all the hard questions but not these anyways no solving needed here just an example will do( my book sucks)
Let's take a look at the second one. It starts like 8!, but that is 8*7*6*5*4*3*2*1. But the last part 5*4*3*2*1 isn't there, and that's exactly 5!. So we need 8!, but not the 5!, so 8!/5!. Check: