Why do they use 40 instead of 45 while scoring in tennis? - Quora
禮 på Twitter: "6) After 5 Points Played - Calculated the probability to win the game after certain point (conditional probability). - With p=50%, After 40-30 (30-40), one wins (losses) the game
Love, Ace, Set... All Tennis Terms Explained | Tennis Glossary | Keith Prowse
Tennis scoring system - Wikipedia
The Giant Glossary of Tennis Terms - Pro Tennis Tips
Ex 1.6, 7 - In a group of 65 people, 40 like cricket, 10 both
101 Tennis Terms You Need to Know - Tennis 4 Beginners