A few people missed the reasoning for this post. It is not to increase the odds of getting females, but instead increasing the odds of producing a given number of females.

As the OP says, if you only have room for 2 plants to flower you want 2 females. How many seeds should one start with to give the best odds (within reason once approaching 100%) to have 2 females?

It isn't trying to say you have more/less chance at all/no females, it is just looking at: if you want X females, you should start with Y seeds. The averages will always remain 50/50 on the whole, but planting 10 seeds and wanting 2 females would pretty much be a "guarantee". Is 9 seeds enough for 2 females? How about 7? Etc...
eggrole1 Reviewed by eggrole1 on . decrease the chance of having all males using math Let's say you've got a small grow space and can only flower two plants. So you plant 3 seedlings instead of 2 hoping to increase your chances of having 2 females. Common sense, right? But by how much exactly did you increase your chances? If you only have 2 seedlings, assuming you don't have feminized seeds and ignoring environmental factors which might affect sex, you've only got a 1-in-4 chance (25%) that both are female. But there's also a 1-in-4 chance that both are males. There's a Rating: 5