A library subscribes to two different weekly news magazines, each of which is supposed to arrive in Wednesday's mail. In actuality, each one could arrive on Wednesday (W), Thursday (T), Friday (F), or...

A library subscribes to two different weekly news magazines, each of which is supposed to arrive in Wednesday's mail. In actuality, each one could arrive on Wednesday (W), Thursday (T), Friday (F), or Saturday (S). Suppose that the two magazines arrive independently of one another and that for each magazine

P(One of the two magazines arrives on W)=0.4   P(One of the two magazines arrives on F)=0.2         P(One of the two magazines arrives on T)=0.3                       P(One of the two magazines arrives on S)=0.1

Let X denote the total number of days beyond Wednesday that it takes for both magazines to arrive.

What are the possible values of X?