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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. ## Setup Follow the setup instructions for Crystal here: http://exercism.io/languages/crystal More help installing can be found here: http://crystal-lang.org/docs/installation/index.html ## Making the Test Suit Pass Execute the tests with: ```bash $ crystal spec ``` In each test suite all but the first test have been skipped. Once you get a test passing, you can unskip the next one by changing `pending` to `it`. ## 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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181 entries across 181 versions & 1 rubygems