...based on the NUMBER of mailboxes and
given typical urban population density...
The Big Bang Theory Season 2, Episode 15
There are a NUMBER of acceptable answers.
For example, C, near-Earth transport.
The Big Bang Theory Season 2, Episode 13
Image NUMBER one: Frenchman
on bicycle carrying baguettes.
The Big Bang Theory Season 7, Episode 5
Number one, and of course, NUMBER two.
The Big Bang Theory Season 2, Episode 22
Judging by my e-mail, a NUMBER of prisoners
at the Michigan State Penitentiary found it.
The Big Bang Theory Season 1, Episode 17