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arr = [1,1,1,3,3,3,5,5,5,7,7,7,9,9,9,11,11,11,13,13,13,15,15,15]
p arr.combination(3).select{|c| c.reduce(:+) == 30}

Success #stdin #stdout 0.05s 9784KB

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Standard input is empty

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[]

https://ideone.com/sR4wcp

language:

Ruby (ruby 2.5.5)

created:

visibility:

public

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