Ononot — In a simplified card game, the universal set U of all suits

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Set Theoryeasy

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In a simplified card game, the universal set $U$ of all suits is $U = \{\spadesuit, \heartsuit, \diamondsuit, \clubsuit\}$ . If $R = \{\heartsuit, \diamondsuit\}$ represents the red suits, which set represents the complement $R^c$ ?