if a ( a - 2 ) = 2 and b ( b - 2 ) = 2 , where a ≠ b , then a + b =
"i . e . if a = - 1 then b = 2 or if a = 2 then b = - 1 but in each case a + b = - 1 + 2 = - 1 answer : option a"
subtract(subtract(subtract(subtract(add(add(2, 2), subtract(2, 2)), const_1), const_1), const_1), const_1)