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Subject: Linux lab question - chmod not producing expected permissions on lab 3

Hi Professor,

I am working on Lab 3 (file permissions) and running into an issue I cannot figure out.

What I am trying to do:
Set the file report.txt so that the owner can read and write, the group can only read,
and others have no permissions at all (expected: -rw-r-----).

What I tried:
I ran: chmod 640 report.txt
Then checked with: ls -l report.txt

What I got:
-rw-r--r-- 1 sam students 0 Jun 3 14:22 report.txt

The "others" section is showing read permission (r--) instead of no permissions (---).
I have tried running the chmod command twice and rebooting the VM, and the result is the same.

Environment:
I am using the class Ubuntu VM in VirtualBox on Windows 11.

Is there something I am missing about how chmod 640 works, or is something else
overriding the permissions I am setting?

Thank you for your time,
Sam Rivera
sam.rivera@EMAIL.com