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Mathematics-Cartesian Product
The set of all ordered pairs ( a, b ) where a Є A, and b Є B, is called the cartesian product of 2 sets A and B, and is denoted by A x B. It is also known as cross product
Thus A x B = { ( a, b ) : a Є A, b Є B }
If A & B are ø, then A x B = ø
Eg ) If A = {1, 2, 6} & B = {6, 9}
then A x B = {( 1, 6), (1, 9), (2, 6), (2, 9), (6, 6), (6, 9)}