How many 6 digit numbers are there in all?
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There are 999999–100000+1=900000 6 digit numbers, since the previous one and the next one always differ by one. Method 2: We have 9 options choosing the hundred-thousand digit and we have 10 options choosing the other digits. So 9*10^(5) are the numbers of combinations of six-digit numbers, which is 900000.
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Answer:
There are 999999–100000+1=900000 6 digit numbers, since the previous one and the next one always differ by one.
Method 2: We have 9 options choosing the hundred-thousanddigit and we have 10 options choosing the other digits. So 9*10^(5) are the numbers of combinations of six-digit numbers, which is 900000.
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