how many times does the digit 1 ocurr starting with 1809 and ending with 2019?
Here are the distributions of all 10 digits 0 - 9 between 1809 and 2019:
(0=62, 1=242, 2=61, 3=41, 4=41, 5=41, 6=41, 7=41, 8=132, 9=142)Total = 844
As you can see, 1 occurs 242 times between 1809 and 2019 inclusive.