Let the given set be
1) We known that ,An element is called the maximal element of if Where .
Thus and are the maximal element.
2) We known that ,an element is called the minimal element of if Where .
Thus , are maximal element.
3)The upper bound of are 18,36,72
4) Since 18 is the least element of .
Thus , least upper bound of is 18.
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