Lily came home with six cups with num-bers on them. She told her mother these are her awards in the number games in the school. The game was in the six cups. The cups were arranged in a line, and the numbers on them are as fellows: 1 4 2 .5 3 ?. The students Were asked to find the correct number for \"?\". Lily thought a while and she was the first one to give the correct answer.