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OpenStudy (anonymous):
• During a toast at a party, there were 105 “clicks” of glasses. How many people took part in the toast?
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OpenStudy (anonymous):
nC2 = 105
OpenStudy (anonymous):
So we have to find n?
OpenStudy (anonymous):
yes!
OpenStudy (anonymous):
Great :)
OpenStudy (anonymous):
But did you understood how we got nC2?
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