Question

aflati n€N pentru care 3n+5 supra n+1 €N

Answer 1

3n+5/n+1∈N,n∈N
n+1/n+1  ⇒n+1/3n+3
n+1/3n+5⇒n+1/3n+5
Le scadem:n+1/-2⇒n+1∈D2
                            n+1∈{1,2}
                            n∈{0,1}
                            n∈N⇒S:n∈{0,1}