Write the contrapositive of the major premise of this syllogism to determine whether the following argument is valid or invalid:
all nondogs are not blue.
jim is blue.
therefore, jim is a dog.

At a pizza shop 70% of the customers order a pizza 25% of the customers order a salad and 15% of the customers order both a pizza and a salad if s customer is chosen at random what is the probability that he or she orders either a pizza or a salad