Use the discount of 142365, and the reverse of the picture 1 is 5. One thing to know about this problem is that it is impossible to see the opposite figures at the same time. For the first graph, the number 1 is not opposite to 4 and 6. For the second graph, we can know that the number 1 is not opposite to 2 and 3, so the number 1 can only be opposite to the number 5. In the same way. As for the number 3, combined with Figure 2 and Figure 3, we can know that the number 3 is not opposite to 2, 3, 4 and 5, but only opposite to the number 6. 2 can only be opposite to 4.

The origin of numbers

Numbers originated in China. According to historical records, Emperor China had thirteen brothers, who were called Tian Ling. One of them invented numbers, and then invented heavenly stems and earthly branches. Invent the numbers zero, one, two, three, four, five, six, seven, eight, nine, ten, twenty, thirty, thirty, one hundred, one thousand and ten thousand. There is also a saying that numbers originated in ancient India and were not invented by Arabs. Numbers were later mastered by Arabs for business, improved and spread to the west.