Cards numbered 1, 2, 3, . . . , 10 are placed in a box. The box

Question:

Cards numbered 1, 2, 3, . . . , 10 are placed in a box. The box is shaken, and a blindfolded person selects two successive cards without replacement.
a. What is the probability that the first card selected is numbered 6?
b. Given that the first card is numbered 6, what is the probability that the second is numbered 9?
c. Find the probability of selecting first a 6 and then a 9.
d. What is the probability that both cards selected are numbered over 5?