Can someone please answer. There is one problem. There's a picture. Thank you!

asked Aug 22, 2017 156k views

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$\displaystyle \binom{40}{12}=(40!)/(12!28!)=(29\cdot30\cdot\ldots\cdot39\cdot40)/(1\cdot2\cdot\ldots\cdot11\cdot12)=5,586,853,480$

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