How many diff number of 7 digits? – InterviewSolution

1.	How many diff number of 7 digits?
Answer» There are1 billion9 digit numbers (000,000,000 through 999,999,999). There are45 differentcombinations oftwo differentnumerals (10 x 9 divided by 2). There are 512 (2 to the 9th power) different permutations for anytwonumbers to be used in a 9 digit number. 45 x 512 = 23,040 - 10 = 23,030.

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