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Check out this Advanced Knowledge Problem of the Week. Be sure to let us know how you solved it in the comments below or on social media! Solution below. Solution Video

Check out this Problem of the Week. Be sure to let us know how you solved it in the comments below or on social media! Solution below. Solution Video

Check out this Advanced Knowledge Problem of the Week. Be sure to let us know how you solved it in the comments below or on social media! Solution below. Solution Video

Here are a couple neat combinatorial identities.

Check out this Problem of the Week. Be sure to let us know how you solved it in the comments below or on social media! Solution below. Solution Video

Check out this Advanced Knowledge Problem of the Week. Be sure to let us know how you solved it in the comments below or on social media! Solution below. Solution Video

Here is a neat little theorem referred to as the "Happy ending problem" by Paul Erdős, due to it resulting in the marriage of two mathematicians. Happy Valentines Day!

Check out this Problem of the Week. Be sure to let us know how you solved it in the comments below or on social media! Solution below. Solution Video

Here are some neat generating functions for different notable sequences of numbers.

Check out this Advanced Knowledge Problem of the Week. Be sure to let us know how you solved it in the comments below or on social media! Solution below. Solution Video

Check out this Problem of the Week. Be sure to let us know how you solved it in the comments below or on social media! Solution below. Solution Video