Two cards are drawn successively and without replacement from an ordinary deck

Two cards are drawn successively and without replacement from an ordinary deck of playing cards Compute the probability of drawing

a. Two hearts.
b. A heart on the first draw and a club on the second draw.
c. A heart on the first draw and an ace on the second draw.
Hint: In part ©, note that a heart can be drawn by getting the ace of hearts or one of the other 12 hearts.