Question

Classify the following as a finite or infinite set:
(i) $A=\{xϵN:(x-1\left)\right(x-2)=0\}$
(ii) $B=\{xϵN:xisodd\}$

Answer 1

(i) $A=\{x\in N:(x-1\left)\right(x-2)=0\}$

finite

(ii) $B=\{x\in N:xisodd\}$

infinite