SOLUTION: there are 15 employees that must attend training session where only 3 people can be trained at a time. how many different possible groups are there?

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Question 320474: there are 15 employees that must attend training session where only 3 people can be trained at a time. how many different possible groups are there?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
GROUP 1=15*14*13
GROUP 2=12*11*10
GROUP 3=9*8*7
GROUP 4=6*5*4
GROUP 5=3*2*1
15*14*13+12*11*10+9*8*7+6*5*4+3*2*1
2,730+1,320+504+120+24=4,698 ANS.