Question

One hundred riders from several countries participated in a bicycle race. Only eighty riders, including Pablo and Felipe, finished the race. Pablo finished and Felipe was the winner. All the riders' countries of origin and finishing times were recorded on the race register. No two riders who finished had the same time and those who did not finish were recorded as DNF.

Based on this information, determine if each set is well-defined. Set is the set well-defined? Yes No
The set of riders who finished 10 minutes or more after the winner
The set of the three least tired riders at the end
The set of riders with the best looking bicycles
The set of riders who finished the race The set of countries of origin of the riders that didn't finish

Answer 1

Set is the set well-defined? Yes No

1. The set of riders who finished 10 minutes or more after the winner: Yes (Well-defined)

2. The set of the three least tired riders at the end: No (Not well-defined, "least tired" is subjective and not clearly defined)

3. The set of riders with the best-looking bicycles: No (Not well-defined, "best-looking" is subjective and not clearly defined)

4. The set of riders who finished the race: Yes (Well-defined)

5. The set of countries of origin of the riders that didn't finish: Yes (Well-defined)