SOLUTION: How do I solve this question? You own 9 travel books and are taking 4 on vacation. In how many ways can you choose 4 travel books from the total group. I think it is 9C4, but

Question 875676: How do I solve this question?
You own 9 travel books and are taking 4 on vacation. In how many ways can you choose 4 travel books from the total group.
I think it is 9C4, but don't know how to solve that
Found 2 solutions by ewatrrr, jim_thompson5910:
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
9C4 good work
9C4 = = 126
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
9 C 4 = (9!)/(4!*(9-4)!)

9 C 4 = (9!)/(4!*5!)

9 C 4 = (9*8*7*6*5!)/(4!*5!)

9 C 4 = (9*8*7*6)/(4!)

9 C 4 = (9*8*7*6)/(4*3*2*1)

9 C 4 = 3024/24

9 C 4 = 126
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