Answer these questions for the poset ({2, 4, 6, 9, 12, 18, 27, 36, 48, 60, 72}, |). a) Find the maximal elements. b) Find the mi
nimal elements. c) Is there a greatest element? d) Is there a least element? e) Find all upper bounds of {2, 9}. f ) Find the least upper bound of {2, 9}, if it exists. g) Find all lower bounds of {60, 72}.
