Question

quantos sao os arranjos de 11 elementos 4a4

Answer 1

Olá!

$A_{\mathrm{11,4}}=\frac{11!}{11-4!}$

$A_{\mathrm{11,4}}=\frac{11!}{7!}$

$A_{\mathrm{11,4}}=\frac{11\cdot 10\cdot 9\cdot 8\cdot \diagup\!\!\!\!7!}{\diagup\!\!\!\!7!}$

$A_{\mathrm{11,4}}={11\cdot 10\cdot 9\cdot 8}$

$A_{\mathrm{11,4}}={7920}$

Espero ter ajudado!