PRACTICE PROBLEMS - WELL DEFINED SETS

State which of the following sets are well – defined.

  1. A={tall people}
  2. B={numbers less than 10}
  3. C={songs performed by Rihanna}
  4. D={World Cup teams from Europe}
  5. E={popular fruit}
  6. R={Apple products}
  7. S={Marvel movies}
  8. T={fragrant flowers}
  9. V={Prime numbers}
  10. W={Even Numbers}
  11. X={Large Numbers}
  12. Y={Small Numbers}