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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?
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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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