Slips of paper are placed in a large hat and thoroughly mixed. Ten slips bear the number 1, 20 slips bear the number 2, 30 slips bear the number 3, and 5 slips bear the number 4. What is the probability of drawing

a. A 1?

b. A 2?

c. A 3?

d. A 4?

e. A 1 or a 4?

f. A 1 or a 2 or a 3 or a 4?

g. A 5?

h. A 2 and then a 3? (The number drawn first is replaced prior to the second draw.)