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1. 设全集 $U=\{1,2,3,4,5\}$, 集合 $M$ 满足 $\partial_{j} M=\{1,3\}$, 则 ()

Gaokao · Math · previous-year question

  1. A.$2 \in M$correct
  2. B.$3 \in M$
  3. C.$4 \notin M$
  4. D.$5 \notin M$

Answer

A. $2 \in M$

Explanation

【详解】由题知 $M=\{2,4,5\}$, 对比选项知, A 正确, $\mathrm{BCD}$ 错误 故选: A

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