2. It can be said that statement P is a sufficient condition for statement Q if PQ is true. In other words, in order to know that Q is true it is sufficient to know that P is true. Let x be an integer. a) Give a sufficient condition on x for x/4 to be a negative even integer. Justify your answer. b) Give a necessary but not sufficient condition on x for x/4 to be a negative even integer. Justify your