$$\text { Under what condition is this statement true for all } x \text { and } y ? ( x + y ) ^ { n } = x ^ { n } + y { } ^ { n }$$

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The Answer of $$\text { Under what condition is this statement true for all } x \text { and } y ? ( x + y ) ^ { n } = x ^ { n } + y { } ^ { n }$$

$\text { Under what condition is this statement true for all } x \text { and } y ? ( x + y ) ^ { n } = x ^ { n } + y { } ^ { n }$