How many whole numbers between 1,001 and 9,999 are there which have exactly 3 identical digits?

How many whole numbers between 1.001 and 9,999 are there which have exactly 3 identical digits?
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2 Answers

???????? "hole numbers" ????????

em thangs be INTEGERS
by

There are three numbers in the 1000's that thave three 1's.

1011

1101

1110

There are three numbers in the 2000's that thave three 2's.


2022

2202

2220

And so on ...

Since threre are nine lots of x000, x = 1 to 9, then there are nine lots of three identical digit sequences.

Answer: 27

by Level 11 User (81.5k points)

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