List of practice Questions

Four teams T1, T2, T3, T4 play a tournament where each team plays exactly two matches.
Rules:
1. No match ends in a draw.
2. T1 defeats T3.
3. T4 plays exactly one match before it plays T2.
4. T2 wins exactly one match.
5. T3 does not defeat T4.
6. Total matches = 4.
How many valid sequences of wins/losses across all matches are possible?

Four players — W, X, Y, Z — play a round-robin tournament (each plays each once).
A win gives 2 points, loss 0.
W scores more points than X.
Y wins exactly one match.
Z does not lose to X.
How many distinct possible point-tables exist for the four players?