SOLUTION: How many ways are there to select 25 books from a collection of 27 books? Would you do a combination of 25C27?

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Question 986682: How many ways are there to select 25 books from a collection of 27 books?
Would you do a combination of 25C27?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
You would do it the other way around. It would be 27 C 25

Use this formula shown below to compute 27 C 25



In this case, n = 27 and r = 25.

Side Note: due to symmetry, we can say 27 C 25 = 27 C 2. Notice how the 25 and 2 add back up to 27. So it will be easier to compute 27 C 2 instead of 27 C 25.