Array#sumはRuby2.4から、それより前のバージョンでArray#sumっぽいことがしたい時はArray#injectで代用可能。
[1,2,3,4,5].inject(:+)
参考
http://rurema.clear-code.com/query:sum/
http://rurema.clear-code.com/2.3.0/method/Enumerable/i/inject.html
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