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51) Cái ngẫu nhiên là cái...a) Diễn ra hoàn toàn không chịu sự chi phối của quy luật nàob) Hoàn toàn diễn ra theo quy luậtc) Biểu hiện của quy luậtd) Không biểu hiện của bất cứ quy luật nào

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