Question 1119998: how many different numbers of 7 digits are there
Found 2 solutions by solver91311, ikleyn:
Answer by solver91311(24713)   (Show Source):
You can put this solution on YOUR website!
Smallest 7-digit number: -9,999,999
Largest 7-digit number: 9,999,999
So from -9,999,999 to -1 inclusive, there are 9,999,999 different numbers, but 999,999 of them have only 6 digits, so there are 9,000,000 negative 7 digit numbers.
Similarly, there are 9,000,000 positive 7 digit numbers.
Consequently, there are 18,000,000 different 7 digit numbers.
If your instructor says you weren't supposed to consider negative numbers, ask "Why?" until the instructor agrees that you should have included them or admits s/he should have asked the question differently.
John
My calculator said it, I believe it, that settles it
Answer by ikleyn(52803)  (Show Source):
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