A) \[100\]
B) \[90\]
C) \[50\]
D) \[45\]
Correct Answer: B
Solution :
Number of elements is \[S=10\]and \[A=\{(x,y):x,y\in S,\,x\ne y\}\] \[\therefore \] Number of elements in \[A=10\times 9=90\]
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