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Consider the divisibilty partial order on the set A = {2,4,6,10,12,20} so that aRb if and...

Consider the divisibilty partial order on the set A = {2,4,6,10,12,20} so that aRb if and only if a|b

a). List any greatest elements (or state that there are none):

d). List any maximal elements (or state that there are none):

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