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>> No.11519791 [View]
File: 139 KB, 462x444, __fujiwara_no_mokou_touhou_drawn_by_shangguan_feiying__900a07ac968440ae9fb0c700e567ddfb.jpg [View same] [iqdb] [saucenao] [google]
11519791

>>11519783
>dude how many subsets does a set with n elements have
Literally that simple.
>inb4 how do I count subsets
Consider functions [math]S \rightarrow \{ 0, 1 \}[/math] or whatever.

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