S K Gupta and Anubhuti Gangal Solutions for Chapter: Sets, Exercise 5: Chapter Assessment

Let $E=\left\{\mathrm{letters} \mathrm{of} \mathrm{SON}\right\}, F=\left\{\mathrm{letters} \mathrm{of} \mathrm{MAMMAL}\right\}$, then $E$ and $F$ are disjoint sets. 

If $A=\left\{1, 3, 5, 7\right\}, B=\left\{2, 4, 6, 8\right\}, C=\left\{3, 5, 6\right\}$, find $A\cap B$

If $A=\left\{1, 3, 5, 7\right\}, B=\left\{2, 4, 6, 8\right\}, C=\left\{3, 5, 6\right\}$, find $B\cap C$

If $A=\left\{1, 3, 5, 7\right\}, B=\left\{2, 4, 6, 8\right\}, C=\left\{3, 5, 6\right\}$, find: $A\cup B\cup C$

If $A=\left\{1, 3, 5, 7\right\}, B=\left\{2, 4, 6, 8\right\}, C=\left\{3, 5, 6\right\}$, find: $A\cap B\cap C$.

$A\cup A=$_____

$A\cap A=$_____

$A\cap \phi =$_____set  [empty/finite/infinite]