rw-
Write permission has no effect in the absence of execute permission, so this mode behaves just like the above mode.
r-x
This mode permits the files in a directory to be listed and permits access to those files. However, files can’t be created or deleted. Access means that you can view, change, or execute the files as permitted by the files’ own permissions.
-x
Files in this directory can be accessed, but the contents of the directory can’t be listed, so you have to know what filename you’re looking for in advance (unless you’re exceptionally good at guessing). Files can’t be created or deleted.
rwx
You can do anything you want with the files in this directory, as long as it’s permitted by the permissions on the files themselves.
Directory write permission determines whether you can delete files in a directory. A read-only file can be deleted if you have permission to write to the directory containing it. You can’t delete a file from a read-only directory even if you’re allowed to make changes to the file.
This also means that if you own a directory you can always delete files from it, even if those files belong to root.