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 manyways can she make her selection? How many ways can she make her selection if he decides that one of thefish is a must?
A)56; 35
B)6,720; 840
C)336; 210
D)3,360; 420

Question

Quizplus · Accepted Answer

The number of ways Mary can select 5 fish out of 8 is calculated using combinations: 8C5 = 8! / (5!(8-5)!) = 56. If one fish is a must, then she needs to choose 4 out of the remaining 7, which is 7C4 = 35.

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