You are right, i figured it wrong.
(a) To win $1 if the first card is a club, and the second a diamond, and the third is a heart, and the fourth is a spade, in this order.
Probability of (a) = (13/52)*(13/51)*(13/50)*(13/49)
(b) To win $1 if the four cards are of four different suits, in...