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Considerar um conjunto numerico em falso ou verdadeiro
Ola quero saber eese exercicios me expliquem achei esse exercicios num livro e nao consigo responderprocurei em todos os lugares mas nao acho nada um conjunto denominado A= {{4,5},{5},{6}}
a)4 pertence ao A
b)vazio esta contido no A
c){6}esta contido no A
d){6} pertence ao A
e)6 não esta pertence ao A
f){{4,5}} esta contido no a
me expliquem qual ´verdadeira ou falso e o por que obrigado
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