Question 1146667
.
<pre>
The total number of vehicles is 10 + 4 + 12 + 5 = 31.


It is the denominator of the fraction.


The subset <U>"used" + "cars"</U> has 10 (new cars) + 4 (used cars) + 5 (used trucks) = 19 elements.


It is the numerator of the fraction.


The probability under the question is  {{{19/31}}}.
</pre>