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# Difference Of Squares Find the difference between the square of the sum and the sum of the squares of the first N natural numbers. The square of the sum of the first ten natural numbers is (1 + 2 + ... + 10)² = 55² = 3025. The sum of the squares of the first ten natural numbers is 1² + 2² + ... + 10² = 385. Hence the difference between the square of the sum of the first ten natural numbers and the sum of the squares of the first ten natural numbers is 3025 - 385 = 2640. ## Running tests In order to run the tests, issue the following command from the exercise directory: For running the tests provided, `rebar3` is used as it is the official build and dependency management tool for erlang now. Please refer to [the tracks installation instructions](http://exercism.io/languages/erlang/installation) on how to do that. In order to run the tests, you can issue the following command from the exercise directory. ```bash $ rebar3 eunit ``` ### Test versioning Each problem defines a macro `TEST_VERSION` in the test file and verifies that the solution defines and exports a function `test_version` returning that same value. To make tests pass, add the following to your solution: ```erlang -export([test_version/0]). test_version() -> 1. ``` The benefit of this is that reviewers can see against which test version an iteration was written if, for example, a previously posted solution does not solve the current problem or passes current tests. ## Questions? For detailed information about the Erlang track, please refer to the [help page](http://exercism.io/languages/erlang) on the Exercism site. This covers the basic information on setting up the development environment expected by the exercises. ## Source Problem 6 at Project Euler [http://projecteuler.net/problem=6](http://projecteuler.net/problem=6) ## Submitting Incomplete Solutions It's possible to submit an incomplete solution so you can see how others have completed the exercise.
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