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2 of 2 cleaned up syntax

Question about inode and permission command

Can anyone tell me if this is true or false?

Does the inode of a file have the addresses of blocks containing the file's content?

Also for the permission command, there was a question asking that I have the right to change permissions for existing file, where the owner (r,w) g(r) condition. So I thought it's applicable for chmod 640 filename.txt and chmod u+rw g+r filename.txt, but apparently only the 640 is correct. Anyone know why the u+rw is not part of the answer?