there are 24 dolphins in an ocean park. the caretaker tags 6 of them with small childchips and returns them to the ocean park. the next month, he randomly selects five dolphins from the ocean park.
a.) Find the probability that exactly two of the selected dolphins are tagged.
A. 6C2 18C3/24C5
B. 6C3 18C2/24C5
C. 6P3 18P2/24P5
D. 6P2 18P3/24P5

b.) what were some of your assumptions in part (a) of this item? justify your answer ​