1000000000, 1000000001, 1000000002, ..., 9999999998, 9999999999
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Number of 7 digit combinations out of the 10 one-digit numbers = 120.
There are 5! = 120 such numbers.
There are 151 3-digit numbers that are divisible by 6.
There are 90,000 such numbers.
The units digit of a two digit number exceeds twice the tens digit by 1. Find the number if the sum of its digits is 10.