Lista de exercícios do ensino médio para impressão
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(CESCEM - 1977) The set $\,\mathbb{X}\,$ is a subset of the$\,\mathbb{N}\,$ (natural numbers) and has the following elements:
12 multiples of 4
7 multiples of 6
5 multiples of 12
8 odd numbers
The number of elements of $\,\mathbb{X}\,$ are:
a)
32
b)
27
c)
24
d)
22
e)
20

 



answer: Answer (D)
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(MACKENZIE - 1969) Knowing the set $\,\mathbb{A}\,=\,\lbrace\,\lbrace\,1\,\rbrace , \,\lbrace\,2\,\rbrace,\,\lbrace\,1,\,2\,\rbrace\,\rbrace\,\;$, which one of the following statements is correct?
a)
$\,\{1\}\,\notin \mathbb{A}\,$
b)
$\,\{1\}\,\subset \mathbb{A}\,$
c)
$\,\{1\}\,\cap\,\{2\}\,\not\subset \, \mathbb{A}\,$
d)
$\,2\,\in \mathbb{A}\,$
e)
$\,\{1\}\,\cup\,\{2\}\,\in \, \mathbb{A}\,$

 



answer: Answer (E)
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