Posted by **Eric** on Tuesday, September 13, 2011 at 11:30pm.

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?

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**Blob**, Wednesday, September 14, 2011 at 1:57am
2 * 5 = 10

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**Reiny**, Wednesday, September 14, 2011 at 9:27am
Blob's answer is not correct.

This is like choosing 2 of 5, which is

C(5,2) = 5!/(3!2!) = 20

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**Kyle**, Tuesday, February 12, 2013 at 5:49pm
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?

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**Anonymous**, Tuesday, October 1, 2013 at 11:15pm
20

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**Zainab**, Thursday, February 19, 2015 at 11:51am
5 sisters to fill 2 spots so 4. 5*4=20 then 20/2= 10

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