qwer: 6

Answer 1

$\color{red}{\text{Finite Union of Finite Sets is Finite.}}$ i.e. If we have finite number of finite sets, then their union will necessarily be finite.

Union of $S_1,S_2, \dots, S_n$ is infinite set $\text{iff}$ at least one $S_1,S_2, \dots, S_n$ is infinite set.

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