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Question Number 203351 by Mingma last updated on 17/Jan/24

Answered by witcher3 last updated on 17/Jan/24

$$\mathrm{x}\in \mathrm{E}\cap \mathrm{F}\iff (\mathrm{x}\in \mathrm{E}\mathrm{\&}\mathrm{x}\in \mathrm{F})$$$$\iff (\mathrm{x}\in \mathbb{N}\mathrm{\&}1⩽\mathrm{x}⩽15\mathrm{\&}\frac{\mathrm{x}+1}{2}\in \mathbb{Z})$$$$\mathrm{x}\in \mathbb{N}\Rightarrow \mathrm{x}⩾0\Rightarrow \frac{\mathrm{x}+1}{2}\in \mathbb{Z}\Rightarrow \frac{\mathrm{x}+1}{2}⩾1$$$$\iff \{\mathrm{x}\in \mathbb{N};1⩽\mathrm{x}⩽15,\mathrm{x}+1\mid 2\},\mathrm{x}=\{1,3,5,7,9,11,13,15\}$$

Commented by Mingma last updated on 17/Jan/24

Perfect ��

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