There are 30 billiard balls in a bag: some have only a red stripe, some only have a blue stripe, still others have both a red and a blue stripe. Anna draws 5 balls simultaneously: 2 have only the red stripe, 2 have both the red stripe and the blue stripe and one has only the blue stripe. Which are the minimum and maximum values of the difference between the number of balls that have only one type of strip? in correspondence with these values, how many balls would have both stripes?