the lowest is 10, the highest is 99...
There are 21 two-digit prime numbers.
There is no THE two-digit natural number because there are many of them. 10, 11, 12, .. 99 are all 2-digit natural numbers.
7 two-digit numbers.
There are 90 two-digit numbers... starting with 10 and ending with 99.
There are 90 positive numbers with two digits. This is because the range of two-digit numbers is from 10 to 99 (inclusive), and there are 90 numbers within this range.
72. (with the range of two digit numbers being from 10 to 99).
All of the odd numbers between 11 and 99 inclusive are two digit numbers that are not multiples of 2. There are 45 of them.
There are 21 two-digit prime numbers.
90
There are five such numbers.
There is no THE two-digit natural number because there are many of them. 10, 11, 12, .. 99 are all 2-digit natural numbers.
7 two-digit numbers.
How many two digit numbers are there in which the tens digit is greater than the oneβs digit ?
There are 2941 4-digit numbers such no two of its digits differ by 1.
The answer will depend on how many digits there are in each of the 30 numbers. If the 30 numbers are all 6-digit numbers then the answer is NONE! If the 30 numbers are the first 30 counting numbers then there are 126 combinations of five 1-digit numbers, 1764 combinations of three 1-digit numbers and one 2-digit number, and 1710 combinations of one 1-digit number and two 2-digit numbers. That makes a total of 3600 5-digit combinations.
There are 45 of them.
36