Question:
A number of the form $\frac{p}{q}$ is said to be a rational number, if
(a) p, q are integers
(b) $\mathrm{p}, \mathrm{q}$ are integers and $q \neq 0$
(c) $\mathrm{p}, \mathrm{q}$ are integers and $p \neq 0$
(d) $\mathrm{p}, \mathrm{q}$ are integers and $p \neq 0$, also $q \neq 0$
Solution:
(b) A number of the form $\frac{p}{q}$ is said to be a rational number, if $p$ and $q$ are integers and