Both permission sets mean owner can read,write,execute; group and world can read,execute.
I expect 4755 to be
r--rwxr-xr-x, but instead it is
What is it?
Copying my comment to StephenKitt below
I've been visualising the permissions as literal bits. So that 755 is
111101101, But now we have a
100 in front of those -- so now
100111101101 which is somehow combined to put an 's' in that first field. It's not an AND because
7&4 is 4, and in fact
7 is as high we can go. So clearly my visualisation/expectation is astray.