There are exclusions that make the expression 8ab^2/4a^2b-8ab^2 undefined. true or false.

True, there are values that would make the expression undefined.

When the denominator of an expression is equal to 0, then the expression is undefined.

In the case of a denominator of 4a^2b - 8ab^2, if either a or b is 0, then the denominator would be zero. And the expression would be undefined.