Answer: 1 B = {1, 2, 3, 4}
Step-by-step explanation:
the natural numbers are those used for counting and ordering, this means that
A = { 1 ,2 , 3 , 4 , 5 , 6 , 7 ... }
since B ⊆ A , this means that all element of B is also an element of A , that is
B = { 1 , 2 ,3 ,4 ...}