Combinations help (1 Viewer)

[Waa]

 

[jimmysmith560]

You may wish to refer to the following thread where this question was discussed:

Perms and Combs

The ratio of the number of combinations of (2n+2) different objects taken n at a time to the number of combinations of (2n-2) different objects taken n at a time is 99:7. Find the value of n. Ans: N= 5 How do I approach these type of questions? And when do I use factorial, perms or combs? I'm...

boredofstudies.org

I hope this helps!

 

[Bob99]

View attachment 36611

i got an answer of n=3.02 and n=-1.25
By any chance is that correct.
Edit: nvm i am wrong
Edit 2: I got n = 5