Is 9×7=7×9 ?
Question 18 Which of the following is not true? (A) (7+8)+9=7+(8+9) (B) (7×8)×9=7×(8×9) (C) 7+8×9=(7+8)×(7+9) (D) 7×(8+9)=(7×8)+(7×9)