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Mathematics 13 Online
OpenStudy (anonymous):

Sara has six necklaces, but her mother will only allow her to wear two at a time. How many different combinations of two necklaces can Sara wear?

OpenStudy (mathstudent55):

You can list them. Since there are only 6 and you need two at a time, listing all the combinations is quick.

OpenStudy (anonymous):

That's gonna take forever, I know there is some kind of equation but I haven't done these since my freshmen year.

OpenStudy (triciaal):

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