Question:
Let $A=\{1,2,3,4,5,6\} .$ Insert the appropriate symbol \inor $\notin$ in the blank spaces:
(i) $5 \ldots \mathrm{A}$
(ii) $8 \ldots \mathrm{A}$
(iii) $0 \ldots \mathrm{A}$
(iv) $4 \ldots A$ (v) $2 \ldots A$ (vi) 10...A
Solution:
(i) $5 \in A$
(ii) $8 \notin \mathrm{A}$
(iii) $0 \notin \mathrm{A}$
(iv) $4 \in A$
(v) $2 \in \mathrm{A}$
(vi) $10 \notin \mathrm{A}$