Answer Happy

\section*{Problem 7} = Let $\displaystyle q \frac{a}{b}s and $\displaystyle r = \frac{c}{d}s be two rational numbers written in lowest terms. Let ss = q + r$ and $\displaystyle s = \frac{e} {f}$ be written in lowest terms. Assume that $s$ is not $0$. \\ Prove or disprove the following two statements. a. If sbs and sds are odd, then sf$ is odd. \\\\ b. If sbs and sds are even, then sfs is even. %Enter your answer below this comment line.