yeaDo you know the Pascal's Triangle identity:
nC(r-1) + nCr = (n+1)Cr ?
So ... just checking ... you can now see the answer is 6 ?
do you mean 15?So ... just checking ... you can now see the answer is 6 ?
The question asked for n, which is 6.do you mean 15?
edit: I got 6C4
oops; i should probably read the questionThe question asked for n, which is 6.