Respuesta :

[tex]\bf _nC_r\iff \left( \begin{array}{llll} n\\ r \end{array} \right)\iff \cfrac{n!}{r!(n-r)!}\\\\ -----------------------------\\\\ \left( \begin{array}{llll} 40\\ 4 \end{array} \right)\implies \cfrac{40!}{4!(40-4)!}\implies \begin{array}{llll} \cfrac{4!}{4!\cdot 36!}\\ \qquad \uparrow \\ \qquad b \end{array}[/tex]

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