If $S$ is a set with 10 elements and $A = \{(x,\ y):x,\ y \in S,\ x
eq y\}$, then the number of elements in $A$ is

Question

If $S$ is a set with 10 elements and $A = \{(x,\ y):x,\ y \in S,\ x 
eq y\}$, then the number of elements in $A$ is

Dr. Abubacker · Accepted Answer

(b)
Number of element is $S = 10$
And $A = \{(x,\ y);x,\ y \in S,\ x 
eq y\}$
$	herefore$ Number of element in $A = 10 	imes 9 = 90$