Advisory story: You all laugh and criticize me for the one who made the mistake
One day the math professor wrote on the blackboard: 9×1 One day the math professor wrote on the blackboard 7 9×2 One day the math professor wrote on the blackboard 18 9×3 One day the math professor wrote on the blackboard 27 9×4 One day the math professor wrote on the blackboard 36 9×5 One day the math professor wrote on the blackboard 45 9×6 One day the math professor wrote on the blackboard 54 Pasi e … Read More