With base one million, you can create one nonillion different numbers; using the traditional decimal (base ten) system, you can form 100 thousand different numbers.
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There are 720 of them. The three digit counting numbers are 100-999. All multiples of 5 have their last digit as 0 or 5. There are 9 possible numbers {1-9} for the first digit, There are 10 possible numbers {0-9} for each of the first digits, There are 8 possible numbers {1-4, 6-9} for each of the first two digits, Making 9 x 10 x 8 = 720 possible 3 digit counting numbers not multiples of 5.
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0 and 5. Every multiple of 5 ends in one of those 2 digits. 5 times any even number ends in 0; 5 times an odd number ends in 5.
The natural numbers, in normal usage, have only 9 digits: 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9.The natural numbers, in normal usage, have only 9 digits: 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9.The natural numbers, in normal usage, have only 9 digits: 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9.The natural numbers, in normal usage, have only 9 digits: 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9.