Originally Posted by

**pablosnazzy**
not to be picky....but why not b+1? bike doesn't start with n, it starts with b.

It's a math thing. N is usually used as a variable in these sorts of cases (probably standing in for number). Just like x is the first variable used in algebra most of the time (and y is introduced if you get a second one), n seems to stand for how many of something you have. At least as far as I can tell.