40 lines
1.2 KiB
Markdown
40 lines
1.2 KiB
Markdown
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# Sum Of Multiples
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Given a number, find the sum of all the unique multiples of particular numbers up to
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but not including that number.
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If we list all the natural numbers below 20 that are multiples of 3 or 5,
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we get 3, 5, 6, 9, 10, 12, 15, and 18.
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The sum of these multiples is 78.
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* * * *
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For installation and learning resources, refer to the
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[exercism help page](http://exercism.io/languages/ruby).
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For running the tests provided, you will need the Minitest gem. Open a
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terminal window and run the following command to install minitest:
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gem install minitest
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If you would like color output, you can `require 'minitest/pride'` in
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the test file, or note the alternative instruction, below, for running
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the test file.
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Run the tests from the exercise directory using the following command:
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ruby sum_of_multiples_test.rb
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To include color from the command line:
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ruby -r minitest/pride sum_of_multiples_test.rb
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## Source
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A variation on Problem 1 at Project Euler [http://projecteuler.net/problem=1](http://projecteuler.net/problem=1)
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## Submitting Incomplete Solutions
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It's possible to submit an incomplete solution so you can see how others have completed the exercise.
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