Question

B= { 1, 3 } in set builder form​

Answer 1

Answer:

B {1<_3}™

Here As u can see the question u asked was good but 2ith set builder u can do this as it is correct

Answer 2

Answer:

Union. The union of two sets is defined as the set of all elements in either set. We can write the union of two sets in set-builder notation as A ∪ B = { x | x ∈ A or x ∈ B }.

The above one is correct answer arwmy...go for it...this is just explanation how to find a set of number in builder form...HOPE IT HELPS YOU ❤