2.3 Four games, one winner:  Below are four versions of the same game. Your archnemesis gets to pick the version of the game, and then you get to choose how many times to flip a coin: 10 times or 100 times. Identify how many coin flips you should choose for each version of the game. It costs $1 to play each game.

a) If the proportion of heads is larger than 0.60, you win $1.
b) If the proportion of heads is larger than 0.40, you win $1.
c) If the proportion of heads is between 0.40 and 0.60, you win $1.
d) If the proportion of heads is smaller than 0.30, you win $1.