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The method to increase the privileges of an executable through setuid in Mac is as follows:

1. Open Terminal.
2. Navigate to the directory containing the executable file using the "cd" command.
3. Type "sudo chmod u+s executablefilename" and hit enter, where "executablefilename" is the name of the executable file.
4. Enter your Mac password.
5. Verify that the setuid bit has been set by using the "ls -l" command. The file should be displayed with an "s" in the permissions section.