# New Checkpoint Added to Probability and Combinatorics Practice

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!

Note by Arron Kau
4 years, 1 month ago

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[example link](https://brilliant.org)example link
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Remember to wrap math in $$...$$ or $...$ to ensure proper formatting.
2 \times 3 $$2 \times 3$$
2^{34} $$2^{34}$$
a_{i-1} $$a_{i-1}$$
\frac{2}{3} $$\frac{2}{3}$$
\sqrt{2} $$\sqrt{2}$$
\sum_{i=1}^3 $$\sum_{i=1}^3$$
\sin \theta $$\sin \theta$$
\boxed{123} $$\boxed{123}$$

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

- 4 years, 1 month ago

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

- 4 years, 1 month ago

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

- 4 years ago

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

- 4 years ago