Let W denote the words in the English dictionary defined the relation R by:

$R=\{(x, y)\in W\times W:$ the words x and y have at least one letter in common. Then, R is?

Let A and B be two sets containing four and two elements respectively. Then the number of subsets of the set $A \times B$, each having at least three elements is............

If $A = \{ 1,2,3,4,5,6 \} , B = \{ 1,2 \} ,$ then $\frac { A } { \left( \frac { A } { B } \right) }$ equal to 

$13$ Planar Surfaces, each of area $1\ m^{2}$ are such that their total area is $7\ m^{2}$. If no three of more of these surfaces have any region in common; Then, the overlap of some Two of These surfaces has an Area.

If n(A)=115, n(B)=326, n(A-B)=47, then $n(A\cup B)$ is equal to