Convert the following:

${342}_{10}$:

$$ A

Question $21(5$ points$)$

$$

A drawing is to be held to determine which $3$ students in a class of $30$ will be able to use the computer today. In the first text box, indicate whether a permutation or combination will be used to solve this problem. In the second text box, provide how many ways these three students can be selected.

$$ A$/$

A