Question: 2019 Fall Final - 14
Continuing from the previous question, what is the probability that Nika has not practiced on any of the
actual exam questions?
(a)
$\left. {225 \choose 50} \middle/ {250 \choose 50} \right.$
(b)
$\left. {225 \choose 25} \middle/ {225 \choose 50} \right.$
(c)
0
(d)
$\left. {225 \choose 25} \middle/ {250 \choose 50} \right.$