A cooking club has 10 members. how many ways can they select a president and vice president from among the members?

A. 180

B. 20

C. 100

D. 90

There are 10 possible ways to select a president from the club, because their are 10 available members to choose from.

After a president is chosen, their are 9 possible ways to select a vice president, because one of the members will already have the position of president, so they can't be vice president (10-1=9)

Now we just multiply to possibilities of presidents by the possibilities of vice-presidents.

president*vicepresident=

10*9=90

Answer = D. 90