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Subtraction of Numbers with More Than 1 Digit

How many 7 di...

Question

How many 7 digit numbers are there?

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Solution

Smallest 7 digit number = 1000000
Largest 7 digit number = 9999999
(9999999-1000000)+1
[to include the first 7 digit number]
= 9000000
$∴$ Total number of 7 digit numbers.

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