1 For the variables \(A\) and \(B\), it is given that \(\operatorname { Var } ( A ) = 9 , \operatorname { Var } ( B ) = 6\) and \(\operatorname { Var } ( 2 A - 3 B ) = 18\).
Find \(\operatorname { Cov } ( A , B )\).
State with a reason whether \(A\) and \(B\) are independent.