23.
The houses on Pine Street and most other streets are numbered so that even numbered homes are on one side of the street while odd numbered homes are on the other. If Pine Street has homes numbered from 1 to 140, it is likely that they are divided by odd and even numbers.
1
There are 6804 such numbers.
27: 077,177,277,377,477,577,677,877,977,717,727,737,747,757,767,777,787,797
There are 45 integers between 11 and 999999 which consist of only one digit being repeated. There are 831430 integers that contain at least one repeated digit.
10293330201309i31841481389
The houses on Pine Street and most other streets are numbered so that even numbered homes are on one side of the street while odd numbered homes are on the other. If Pine Street has homes numbered from 1 to 140, it is likely that they are divided by odd and even numbers.
The pages of a book are numbered from 1 to 128. How many page numbers contain the digit 6?
8 contain the digit 9. Locker numbers are 9, 19, 29, 39, 49, 59, 69, 79.
There are 9000 4-digit numbers. 8*9*9*9 = 5832 of them do not contain a 5 The remaining 3168 contain a 5.
17
three digit numbers
1
-2
-5
-5
There are 15180 combinations.