We've added the following chapters to the Probability and Combinatorics Practice Map:

- Counting with Restriction
- Bijection / Injection / Surjection
- Counting 2
- Combinatorial Review 2

We will continue to extend the practice maps and add new maps on a regular basis. Thank you to all of our new Brilliant Squared members!

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## Comments

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TopNewestplease add some new checkpoints in advanced algebra and calculus as well!!! Brilliant Squared is too gud!!

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Cool. Noticed you put a link to Brilliant Squared members which reminded me of something. Could there be a page full of the names of people who subscribed to Brilliant Squared? I dunno, it'd be just kinda like a "Hall of Fame" sort of thing as an added benefit for subscription. :D

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It was only a short time ago when you were supposedly strongly against \(B^2\)

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Eh, I wasn't really against it. I just thought that Brilliant was capable of getting funding from other sources. I'm sure there are tons places. It's for an AWESOME cause as anybody could tell. :P

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