Question

A=(x apartne lui N|x=10-n,n care apartine lui N)

Answer 1

daca n apartine lui N,inseamna ca x poate lua orice valoare, dar x=10-n
inseamna ca n=0,1,2,3,4,5,6,7,8,9,10
x=10,9,8,7,6,5,4,3,2,1,0
deci A=10,9,8,7,6,5,4,3,2,1,0