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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. 20 b. 18 c. 120 d. 216
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OpenStudy (anonymous):
6 combination 3
OpenStudy (anonymous):
20
OpenStudy (anonymous):
6!/(3! 3!) = (6*5*4) / 3 * 2 = 20
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