Q2. If m and n are integers and neither m nor n is zero, is (m + n)/mn a rational number? Hint: You can use the following definition:

Definition: A real number r is rational if, and only if, it can be expressed as a quotient of two integers with a nonzero denominator. A real number that is not rational is irrational. More formally, if r is a real number, then r is rational integers a and b such that r = and b 0.