Binomial C question (1 Viewer)

[enigma_1]

Find n where: 5C3 + 5C4 = nC4

Thanks

 

[braintic]

Do you know the Pascal's Triangle identity:
nC(r-1) + nCr = (n+1)Cr ?

 

[enigma_1]

Do you know the Pascal's Triangle identity:
nC(r-1) + nCr = (n+1)Cr ?

yea

 

[braintic]

yea

So ... just checking ... you can now see the answer is 6 ?

 

[Squar3root]

So ... just checking ... you can now see the answer is 6 ?

do you mean 15?

edit: I got 6C4

 

[braintic]

do you mean 15?

edit: I got 6C4

The question asked for n, which is 6.

 

[enigma_1]

Yeah, it's 6

 

[Squar3root]

The question asked for n, which is 6.

oops; i should probably read the question