or
or
The digit four appears once in each of the following: 4, 14, 24, 34, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 54, 64, 74, 84 and 94
4 comes 1 to 100 is 20 times
So, 4 comes 10 to 100 is (20 - 1) = 19 times
ans: for a total of 19 times.
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