If someone has a pet bunny do they provide a litter box for them like a cat or is it different for a bunny?

i have two bunnies one will use a litter tray and one wont no matter what i do

Yes, I provide litter boxes for my rabbits, but with rabbit-safe litter materials (I favor yesterday's news covered in a layer of hay). Most cat litters are not safe for use with rabbits and can cause digestive impactions and respiratory issues. 

I always did. They can be pretty easily litter trained and it makes things easier. You can let a litter trained rabbit free roam and you can give them a big pen for a cage and not have to worry about protecting the floor. 

They do not always poop in the litter pan all the time but rabbit poop is super easy to clean up. Just sweep or vacuum it up. Its nothing like dog or cat poop. 

Rabbits can be taught to use a litter pan.  So can a cat and a dog.