In the statement below, the relations hold as written. Statement: P ≤ Q < R = S ≥ T. Conclusions: I. P < S.
II. P ≥ T. Which conclusion(s) definitely follow?

P ≤ Q < R = S gives P < S, so I follows. Between P and T there is no connecting chain (P is on the ≤/< side while T is only bounded above by S), so no definite relation exists — II does not follow.