mfausantosngcl

2023-02-21

How many $4$ digit number are there in all?

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Calculate the total number of necessary natural numbers:
The smallest $4$ digit number is $1000$.
The largest $4$ digit number is $9999$.
Therefore, the total number of $4$-digit numbers
$=\left(9999-1000\right)+1$
$=8999+1$
$=9000$
Hence, there are $9000$ total $4$ digit numbers.

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