The problem of the week will return in the Spring 22 semester. We thank everyone who participated this Fall. For the winter break, we suggest reviewing all the problems from the Fall and working on the additional problems posted at the bottom of the provided solutions.

• Problem 7 Solution submitted by Ashton Keith and Pluto Wang.

• Problem 6 Solved by Ashton Keith and Pluto Wang.

• Problem 5 Solution submitted by Ashton Keith, Maxwell T Meyers, and Pluto Wang.

• Problem 4 Solved by Ashton Keith.

• Problem 3 Solved by Ashton Keith, Maxwell T Meyers, and Pluto Wang.

• Problem 2 Solutions submitted by Ashton Keith and Pluto Wang.

• Problem 1 Solutions submitted by Ashton Keith and Pluto Wang.