Given :
[tex]\begin{gathered} A=\mleft\lbrace3,5,7,9\mright\rbrace \\ B=\mleft\lbrace2,4,6,8,10\mright\rbrace \\ C=\mleft\lbrace12,14,18,20,24\mright\rbrace \\ D=\mleft\lbrace21,26,31,36\mright\rbrace \end{gathered}[/tex]
So, according to the given data, we will check the options:
(i) 13 ∈ C : False because 13 is not one of the numbers of the group C
(ii) 6 ∉ A : True because 6 is not one of the numbers of the group A
(iii) 9 ∉ A : False because 9 is one of the numbers of the group A
(iv) 24 ∈ C : True because 24 is one of the numbers of the group C
