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The relation `f` is defined as ` f={(ab, a+b):a,b in Z}` <br> We know that a relation `f` from a set A to a set B is said to be a function if every element of set A has unique images in set B. <br> Let `ab=16.` We have following possibilities. <br> If `a=1, b=16, " then " a+b=17` <br> If `a=2, b=8, " then " a+b=10` <br> If `a=2, b=4, " then " a+b=8` <br> Thus, first element '16' has three corresponding second elements `17,10,8`, <br> So, Relation R is not a function.