The same mode set two ways, listed after each command

Answer

chmod 751 courses ls -ld courses chmod u=rwx,g=rx,o=x courses ls -ld courses

Both commands produce `drwxr-x--x`. The octal form states all nine bits; the three `=` clauses state each triple exactly, which comes to the same thing.

Sarwar & Koretsky 3e §5.5.2