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OpenStudy (anonymous):
You have 6 friends who want to go to a concert with you, but you only have 3 extra tickets. How many possible ways are there to choose 3 of your 6 friends? A. 120 B. 20 C. 18 D. 216
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OpenStudy (anonymous):
sorry it's (6*5*4)/6
OpenStudy (anonymous):
because in this case (A,B,C) and (A,C,B) for example are the same
OpenStudy (anonymous):
I'm not english speaker so sorry for my bad english :).In every set of 3 elements you have 6 ways to put them in different order which is the same case. Hope you understand it.
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