Question

СРОЧНО!!! ПОМОГИТЕ РЕШИТЬ!!!

Answer 1

$A^3_7=7!/(7-3)!=7!/4!=7*6*5=210\\\\P_6=6!=6*5*4*3*2*1=720\\\\C^2_5=5!/(2!(5-2)!)=5*4*3*2*1/(2*1*3*2*1)=5*2=10.$