Question

determinati multimile A= {xe N / (3x-1) /48}

Answer 1

D48={1,2,3,4,6,8,12,24,48} 

 3x-1=2
  3x=2+1
   3x=3
   x=3:3
   x=1
   
3x-1=8
3x=8+1
3x=9
x=9:3
x=3

A={1,3}