if a set A={1,2,3,4,}...what is AxA

SOLUTION:

GIVEN:

A = { 1,2,3,4 }

A * A = ?

HERE ,

  A * A = { 1,2,3,4 } * { 1,2,3,4 }

.^..  A * A = { (1,1) , (1,2) , (1,3) , (1,4) , (2,1) , (2,2) , (2,3) , (2,4) , (3,1) , (3,2) , (3,3) , (3,4) , (4,1) , (4,2) , (4,3) , (4,4) }