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

Algebra ->  Permutations -> 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       Log On


   

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) About Me  (Show Source):
You can put this solution on YOUR website!
9C4 good work
9C4 = 9%21%2F%284%215%21%29+=+%289%2A8%2A7%2A6%29%2F%284%2A3%2A2%29 = 126

Answer by jim_thompson5910(35256) About Me  (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