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?

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

Math  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

Math  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?

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

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

Math  Sinai, Thursday, September 10, 2015 at 6:12pm
Five sisters times four name pairs for each girl, gives you twenty name combinations. 5×4= 20

Math  alsdfdfdca, Wednesday, November 4, 2015 at 3:06pm
mysis is bad
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