Earlier quoted context omitted.
My prodding was more along the lines that since there was an order of magnitude more applicants this round and they only had a week to look over the applicants, was it nearly impossible to get in being a solo founder? I'm a bit annoyed with myself since I didn't apply to the previous rounds. I first read Hackers & Painters over two years ago, ah well!
I think that figure was based on evidence from the previous 6 (?) rounds. I would guess the 4x more likely for co-founders figure holds. pg usually won't throw out a number unless he really means it.
Right, my guess is also the same.
My question was so pg could chime in with data since YC has gotten much more popular.