Rangeクラスのオブジェクトの指定にはリテラル記法を用います。
| n..m | n以上m以下の範囲 |
|---|---|
| n...m | n上m未満の範囲 |
公式リファレンスも役に立ちます：class Range (Ruby 3.0.0 リファレンスマニュアル)
https://docs.ruby-lang.org/ja/3.0.0/class/Range.html
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