Two friends are about to try a new obstacle course. Neither of them has seen the course before, so the first one to go through is at a disadvantage. For this reason, the friends must have a fair way to pick who goes first. Which probability model gives each friend an equal chance of being selected to go through the course first? A. The friends take turns selecting a card from a deck of 52 cards without replacing it. The first friend to pick a king goes first.
B. One friend writes 1 and 2 on two slips of paper. The other friend randomly picks a slip of paper. The friend who picks a 1 goes first.
C. The friends have three straws and cut one so it is shorter than the other two. The friends take turns randomly selecting a straw without replacing it. The friend who picks the short straw goes first.
D. The friends put 4 marbles in a bag: 3 are red and 1 is blue. The friends take turns drawing marbles. The first friend to pick a red marble goes first.