Question

dado que a = {x ε ℕ | 1 < x < 4} e b = {x ε ℕ | 2 < x < 20}, então a⋂b =

Answer 1

$\boxed{\boxed{\mathtt{a\cap\,b=\{x\in~\mathbb{N}|2\textless~x\textless~4\} }}}$