Rhian likes to wear colored shirts. She has 15 shirts in the closet. Five of these are blue, four are in different shades of red, and the rest are of different colors. What is the probability that she will wear:

a) a blue or red shirt?
b) a red or "not blue" shirt?
c) a blue or "not red" shirt?
d) a red or a "not blue and red" shirt
e) a blue or a "not blue and red" shirt?​