Question

In the following, determine whether A and B are equivalent sets and if so, whether A = B.
A = {even natural numbers less than $10$}, B = {odd natural numbers less than $10$}

Answer 1

If we write $A$ and $B$ in tabular form, we get
$A=\{2,4,6,8\}$
$B=\{1,3,5,7,9\}$
So, $n\left(A\right)\ne n\left(B\right)$
$A$ is not equivalent to $B.$