Determine 55891

Determine the number of nine-digit numbers in which each of the digits 0 through 9 occurs at most once and in which the sums of the digits 1 through 3, 3 through 5, 5 through 7, and 7 to the 9th place are always equal to 10. Find the smallest and largest of these numbers.

Correct answer:

n =  16
a =  280736145
b =  820736154

Step-by-step explanation:

n=16
a=280736145
b=820736154  1: 280736145 2: 280736154 3: 352719046 4: 352719064 5: 451637028 6: 451637082 7: 460917235 8: 460917253 9: 532719046 10: 532719064 11: 541637028 12: 541637082 13: 640917235 14: 640917253 15: 820736145 16: 820736154



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