Question

rezolvare aici va rog !

Answer 1

$\it \Big C_7 ^5 =\dfrac{7!}{5!(7-5)!}=\dfrac{5!\cdot6\cdot7}{5!\cdot2!}=\dfrac{42}{2}=21$

Answer 2

Răspuns:$\red{\bf C_{7}^{5} =21}$

Explicație pas cu pas:

$\bf C_{7}^{5} = \dfrac{7!}{~5!\cdot(7-5)!~} =\dfrac{5!\cdot6\cdot7}{~5!\cdot 2!~} =\dfrac{~\not 5!\cdot6\cdot7~}{\not5!\cdot 2!}= \dfrac{~6\cdot7~}{2!}=\dfrac{42}{2} =21$

$\red{\boxed{\bf C_{7}^{5} =21}}$

#copaceibrainly

P.S.: Daca esti pe telefon te rog sa glisezi spre stânga pentru a vedea rezolvarea completa