Combination problem .. nCr : nCr-1 = 2:3 , nCr-2 : nCr-1 = 4:3

[M4STR0k]

nCr : nCr-1 = 2:3 , nCr-2 : nCr-1 = 4:3, Please find n and r

Could any one help me with this please, i have tried alot and used the rules of combinations but im not doing good with it.

 

[stapel]

nCr : nCr-1 = 2:3 , nCr-2 : nCr-1 = 4:3, Please find n and r

Could any one help me with this please, i have tried alot and used the rules of combinations but im not doing good with it.

Please reply showing what you have tried, so we can see what's going on.

When you reply, please include clarification. In particular, does "nCr-1" mean:

. . . . .\(\displaystyle \mbox{a. }\, {}_nC_r\, -\, 1\)

...as written, or does it really mean the following?

. . . . .\(\displaystyle \mbox{b. }\, {}_nC_{r-1}\)

(Same question for the second ratio.) Thank you!

 

[M4STR0k]

I actually tried alot ..

 

[mmm4444bot]

I actually tried alot ...

Next time, please include the photo with your original request for help. Cheers :cool: