18. Suppose that the domain of the propositional function. P(x) consists of the integers -2, -1, 0, 1, and 2. Write out each of these propositions using disjunctions, con- junctions, and negations. a) 3x P(x) b) VxP(x) d) Vx-P(x) e) -3x P(x) c) 3x-P(x) f) -VxP(x)

Five your answer as a whole or exact number.

Evaluate the combination. 14 =

discrete math   How many phone numbers (7 digits) have no numbers larger than a 6 if the first digit of a phone number can be neither a 0 nor a 1? How many such phone numbers do have a number larger than a 6?