logic problem (fixed wording cuz i suck)

[MINETZ]

suppose an urn contains 90 balls. thirty of these balls are red, and the remaining 60 balls are either black or yellow, in unknown proportions. one balls is to be drawn from the urn, and the color of the ball will determine your payoff. for each of the following 2 pairs choose the alternative you perfer.
Pair 1
a) you will win 100 dollars if a red ball is chosen.
b) you will win 100 if a black ball is chosen
Pair 2
a) you will win 100 dollars if either a red or a yellow ball is chosen
b) you will win 100 dollars if either a black or yellow ball is chosen