Question

B={x∈N/16 pe 3x plus 1 ∈}
Uregent!!!!Va rog!!!

Answer 1

16/3x+1∈N;
⇒3x+1∈d16=[1,2,4,8,16];
⇒3x=0⇒x=0;
⇒3x=1⇒x=1/3∉N⇒nu este solutie;
⇒3x=3⇒x=1;
⇒3x=7⇒x=7/3∉N⇒nu este solutie;
⇒3x=15⇒x=5;
⇒x=[0,1,5];