The total * * * can be composed of 900,000 digits, the first digit cannot be 0, and the remaining 9 digits can be randomly selected; The second bit can be any bit in 10; The third, fourth, fifth, sixth and second places are the same, and can be selected from 10. According to the permutation and combination in mathematics, the total number of * * can be calculated as 9 *10 *10 *10 * 65438.

Numbers from 0 to 9 +0, 2, 3, 4, 5, 6, 7, 8, 9. Select any five numbers (addition only), and the values are15.438+06.17.18.65438+.

For example, the sum values are 15: 9400 1, 9 4 0 1 0, 4 9 1 9 0, 4 0 0 9 1, 400 1. 0 4 0 9 1 、 0 1 9 4 、0 1 0 4 9 、0 0 4 9 1 、0 4 9 1 0。