Question

how many 4-digits numbers are there in all ​

Answer 1

Answer:

9999 is your answer

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Answer 2

$9000 \: four$

There are 4 numbers (any number from 0-9) in a 4-digit number and the starting number should be 1 or bigger than 1. The thousands place in a 4-digit number cannot be 0. The smallest 4 digit number is 1000 and the greatest 4 digit number is

9999. There are

9000 four-digit

numbers in all.