3. How many 8-digit numbers are there in all?
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3. How many 8-digit numbers are there in all?
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Answers: There are nine crore 8-digit numbers in all.
first 8 digit number : 10000000
last 8 digit number : 99999999
total 8 digit numbers = 99999999 - 10000000 +1
=> 90000000 numbers