Answers

2016-07-27T19:40:58+08:00
381 digits were used. But HOW??
Explanation:
We will start with the 3-digit numbers.
163 - 100 = 63 + 1 = 64 》This is the number of the 3 -digit numbers.
64 × 3 = 192 》The total number of digits in the 3-digit numbers.
We will go on to the 2-digit numbers
99 - 10 = 89 + 1 = 90 》This is the number of the 2-digit numbers.
90 × 2 = 180 》The total number of digits in the 2-digit numbers.
We will go to the 1 digited numbers.
[Of course, there are nine numbers which is on 1 digited numbers ( 1, 2, 3, 4, 5, 6, 7, 8, 9 )]
Lastly, we will add the three results.
192 + 180 + 9 = 381 》The answer!!
P.S. I hope it will help....
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