Math
posted by Eric on .
Ann, Mara, Jenny, Tina, and Sue are sisters. Two of the five sisters must help their father at this business each Saturday. How many combinations of two sisters are possible?

2 * 5 = 10

Blob's answer is not correct.
This is like choosing 2 of 5, which is
C(5,2) = 5!/(3!2!) = 20 
Ann, Mara, Jenny, Tina, and Sue are sisters. Two of the five sisters must help their father at his business each Saturday. How Many Combinations of two sisters are possible?

20

5 sisters to fill 2 spots so 4. 5*4=20 then 20/2= 10

Five sisters times four name pairs for each girl, gives you twenty name combinations. 5×4= 20

mysis is bad