User:Piphi/Sandbox

Welcome to Piphi's Wiki!

The Piphi Wiki project is administered by the legendary piphi for supporting educational content useful to avid math students.

Problem of the Week

1983 AIME, Problem 13

For $\{1, 2, 3, \ldots, n\}$ and each of its non-empty subsets a unique alternating sum is defined as follows. Arrange the numbers in the subset in decreasing order and then, beginning with the largest, alternately add and subtract successive numbers. For example, the alternating sum for $\{1, 2, 3, 6,9\}$ is $9-6+3-2+1=5$ and for $\{5\}$ it is simply $5$ . Find the sum of all such alternating sums for $n=7$ .

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A:SAND

Welcome to the sandbox, a location to test your newfound wiki-editing abilities.

Please note that all contributions here may be deleted periodically and without warning.

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About Me

PM me if you want to find out about some cool things you can do with the AoPS wiki.

My main project on the AoPS wiki is a list of all the AoPS admins, everyone is welcome to add more admins to the list by clicking here. I also added most of the info in the Reaper Archives.

Asymptote

For a complete list of my Asymptote drawings, go here.

Name and Surname	Height
John Smith	1.85
Ian Ray	1.89
Zachary Bianchi	1.72

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