How many balls did they need?
In a singles tennis tournament, 111 players participated. They used a new ball for each match. When a player lost one match, he was eliminated from the tournament. How many balls did they need?
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Their is only one winner, so the remaining 110 players were defeated in 110 matches. Therefore, they used 110 balls.
Take from the pack the thirteen cards forming the suit of diamonds and arrange them in this order face downwards with the 3 at the top and 5 at the bottom: 3, 8, 7, Ace, Queen, 6, 4, 2, Jack, King, 10, 9, 5. Now play them out in a row on the table in this way. As you...