Contingency Tables · Exercise 13

Use the information in the to answer the next eight exercises. The table shows the political party affiliation for various members of the U.S. Senate during two separate years when they are up for reelection.
$$\begin{array}{ccccc}\text{Up for reelection:}& \text{Democratic Party}& \text{Republican Party}& \text{Other}& \text{Total}\\ \text{Year A}& \text{20}& \text{13}& \text{0}& \\ \text{Year B}& \text{10}& \text{24}& \text{0}& \\ \text{Total}& & & & \end{array}$$

What is the probability that a randomly selected senator is up for reelection in Year B?

Its source prints no answer for this problem, so there's nothing to check against.

OpenStax, Introductory Statistics 2e · §3.4 Contingency Tables · Exercise 13