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Question about inode and permission command

Can anyone tell me if this is true or false?

does inode of a file has the addresses of blocks containing the file's content?

and for the permission command, there was a question asking that i have the right to change permissions for existile file, where the owner (r,w) g(r) condition, so i thought its 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?