Question

If R is the set of all real numbers and Q is the set of all rational numbers then what is the set (R-Q) ?

Answer 1

The difference of two sets, written A - B is the set of all elements of A that are not elements of B.

R: set of real numbers = {rational number , irrational number }

Q: set of rational numbers = {irrational number }

R - Q = set of irrational numbers.