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11 April, 21:28

How many 9 digit combinations with 10 numbers?

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  1. 11 April, 22:40
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    There are 1 billion 9 digit numbers (000,000,000 through 999,999,999). There are 45 different combinations of two different numerals (10 x 9 divided by 2). There are 512 (2 to the 9th power) different permutations for any two numbers to be used in a 9 digit number
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