Question

class 11th
chapter - 1 (sets)
plz help...

Answer 1

1. Yes --- bcoz all prime numbers are well defined and not repeated 
2. No ---- bcoz One player is good for any person and other player is good for any other person...So it's not well defined 
3. No --- bcoz there are no criteria fixed to be rich
4. Yes -- bcoz natural numbers are well defined 
5. Yes -- bcoz odd integers are well defined