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There are 21 two-digit prime numbers.
There are 17 of them.
7 two-digit numbers.
There is only one such number.
There are 90 two-digit numbers... starting with 10 and ending with 99.
There are 6804 such numbers.
There are 90 two digit numbers, 10 through 99. There are 18 two digit numbers containing a 9. They are 19, 29, 39, 49, 59, 69, 79, 89, and 90 through 99. Therefore, there are 72 two digit numbers that do not contain a 9.
27: 077,177,277,377,477,577,677,877,977,717,727,737,747,757,767,777,787,797
There are 21 two-digit prime numbers.
There are 17 of them.
There are five such numbers.
7 two-digit numbers.
18 positive integers and 36 integers (negative and positive)
There is only one such number.
How many two digit numbers are there in which the tens digit is greater than the one’s digit ?
There are 2941 4-digit numbers such no two of its digits differ by 1.
There are 45 of them.