he examples of intractability we discussed correspond to exponentials and factorials. In practice, where do these arise? Choose All That Apply. Hint: This is a two-point question. a.) Exponentials arise from creating/counting the subsets of n-element sets. b.) Exponentials arise from combinations of sets of n things taken 2 at a time. c.) Exponentials arise from permuting sets of n elements. d.) Factorials arise from creating/counting the subsets of n-element sets. e.) Factorials arise from combinations of.