Question 1 : What does -rwxrwxr-x mean?

The owner has read, write, execute permissions. The group has read, write, execute permissions. Others has read, write, execute permissions.
The owner has read, write, execute permissions. The group has read, write, execute permissions. Others has read and execute permissions
The owner has read, write, execute permissions. The group has read, write, execute permissions. Others has read and execute permissions
The owner has read, write, execute permissions. The group has read, write, execute permissions. Others has read and write permissions.

Question 2 : What does -r--r--r-- mean?

All users have all permission.
All users have the write permission.
All users have the read permission.
All files are locked.

Question 3 : All users have the read permission.

The owner has read, write, execute permissions. The group has read and execute permissions. Others has read, write, execute permissions.
All users have no permissions.
All users have all permissions.
All users have the read permission.

Question 4 : What does -rwxrw-r-- mean?

The owner has read, write, execute permissions. The group has read and execute permissions. Others has only the read permission.
The owner has read, write, execute permissions. The group has read and execute permissions. Others has read, write, execute permissions.
The owner has read, write, execute permissions. The group has read and write permissions. Others has read, write, execute permissions.
The owner has read, write, execute permissions. The group has read and write permissions. Others has only the read permission.

Question 5 : What is the numerical value of -rwxrw-r--?

111110100
123120100
764
761

Question 6 : What is the numerical value of -r--r--r--?

111
666
444
777

Question 7 : What is the numerical value of -rwxrwxrwx?

777
111
444
444

Question 8 : What does the first - mean?

This is a directory.
No one has permissions.
The file has limited permissions.
This is a file.

Question 9 : What is the permission of 755?

What is the permission of 755?
-r-xr-xr-x
-rwx-wx-wx
-rwxr-xr-x

Question 10 : What is the permission of 644?

-rw-r--r--
-rwx-wx-wx
-rwxr-xr-x
-rwxrw-r--?