Solve the problem.
-Mary finds 8 fish at a pet store that she would like to buy, but she can afford only 5 of them. In how many ways can she make her selection? How many ways can she make her selection if he decides that one of the fish is a
Must?
A) 336; 210
B) 3,360; 420
C) 6,720; 840
D) 56; 35

Question

Quizplus · Accepted Answer

Mary can select 5 out of 8 fish in $ \binom{8}{5} = 56 $ ways. If one fish is a must, she needs to choose 4 out of the remaining 7, which can be done in $ \binom{7}{4} = 35 $ ways.

Solve the Problem. -Mary Finds 8 Fish at a Pet Store That She