Question 19
A number $m$ is randomly selected from the set $$
\{11,13,15,17,19\},
$$ and a number $n$ is randomly selected from $$
\{1999,2000,2001,\ldots,2018\}.
$$ What is the probability that $m^n$ has a units digit of $1?$
\{11,13,15,17,19\},
$$ and a number $n$ is randomly selected from $$
\{1999,2000,2001,\ldots,2018\}.
$$ What is the probability that $m^n$ has a units digit of $1?$