Question

U={X/X ∈ N; x≤50}
definir por extensión

Answer 1

U:{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,4que,42,43,45,46,47,48,49,50} :)