Most students in a large college study Mathematics. A teacher chooses three different students at random, one after the other.

Consider these three probabilities:

$R=\text{P}(\text{At least one of the students chosen studies Mathematics})$ $S=\text{P}(\text{The second student chosen studies Mathematics})$ $T=\text{P}(\text{All three of the students chosen study Mathematics})$

Which of the following is true?