SOLUTION: I am going to choose 6 students out of the 15 who currently have A's to be mentors for the students who have C's or lower. How many ways can a group of 6 be selected?

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Question 85179: I am going to choose 6 students out of the 15 who currently have A's to be mentors for the students who have C's or lower. How many ways can a group of 6 be selected?

Answer by scianci(186) About Me  (Show Source):
You can put this solution on YOUR website!
C(15 , 6) = 15%21%2F%28%286%21%29%289%21%29%29
= %28%2815%29%2814%29%2813%29%2812%29%2810%29%29%2F%28%286%29%285%29%284%29%283%29%282%29%29
= (7)(13)(5) = 455