Question

Пожалуйста помогите !!!!

Answer 1

10!/(5!*5!)+10!/(6!*4!)-11!/(6!*5!)=
=6*7*8*9*10/(1*2*3*4*5)+7*8*9*10/(1+2*3*4)-7*8*9*10*11/(1*2*3*4)=
=6*6*7+7*3*10-7*2*3*11=252+210-462=0

Answer 2

спс