Most students in a large college study Mathematics. A teacher chooses three different students at random, one after the other.
Consider these three probabilities:
$R = \mathrm { P }$ (At least one of the students chosen studies Mathematics)
$S = \mathrm { P }$ (The second student chosen studies Mathematics)
$T = \mathrm { P }$ (All three of the students chosen study Mathematics)
Which of the following is true?