Hello all. I seriously need an urgent help from y'all.If you would so kind , could anyone of you please solve these two questions , which is of permutation. My brain couldn't go further :

"How many numbers greater than 5000 can be formed using he digits 3 , 4 , 5 , 6 and 7 without repetition of digits? How many of these are even numbers?"

AND

" How many numbers between 2000 and 8999 (both inclusive) do not have four different digits ? "

please save me, im almost drowned of solving this kind of things