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Id: 2656012
Posted: 2015-04-10 13:15:08
Uploader:
danbooru
Size: 900x1440
Source:
twitter.com/yk_mkm/status/586530346285400065
Rating: Sensitive
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Anonymous
commented at 2015-04-11 22:57:26 » #1720807
(n(n+1))/2
That's the formula you guys need to know. If you can remember that stuff from middle school math
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