https://en.wikipedia.org/wiki/Birthday_problem#Calculating_the_probability Equation 1 and 2 does not get rendered when viewing as PDF. I'm guessing this is related to it being wrapped around <dl><dd> tags which are added by that template. (haven't looked at other pages.)
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As already announced in Tech News, OfflineContentGenerator (OCG) will not be used anymore after October 1st, 2017 on Wikimedia sites. OCG will be replaced by Electron. You can read more on mediawiki.org.