The first time he applied it was with an test prep idea, if I recall PG correctly, and he was rejected. The second time he applied with Dropbox, he was accepte

The first time he applied it was with an test prep idea, if I recall PG correctly, and he was rejected. The second time he applied with Dropbox, he was accepted. After being accepted, he got Arash to join him. It seems to me that about every batch there is a single founder. But they tend to find co-founders after acceptance.