Question

combinari de 7 luate cate 2

Answer 1

= 7!/2!(7-2)!=7!/2*5!=6*7/2=42/2=21

Answer 2

combinari de 7 luate cite 2 este = cu 7!$\frac{7!}{2!(7-2)!}$=[tex] \frac{7!}{2!*5!} = \frac{5!*6*7}{2!*5!} [/tex]  5! cu 5! se simplifica deci $\frac{42}{2} = 21$