There are 15 composite numbers greater than 50 but less than 70
28, 30, 32, 34
.30 is less than 1/4 the size of the smallest whole number, so there's no way.
There is no limitation given to the number of digits in the number, thus: For 3 digit numbers: to be less than 500 the first digit can be only one of {1, 2, 3, 4} leading to 4 × 5 × 4 = 80 numbers For 2 digit numbers: they are all less than 500, and there are 6 × 5 = 30 numbers For 1 digit numbers: they are all less than 500, and there are 6 numbers Thus there are in total 80 + 30 + 6 = 116 numbers that can be made form the digits {1, 2, 3, 4, 5 ,6} without repetitions that are less than 500.
12
5
Prime numbers less than 30 are 2 3 5 7 11 13 17 19 23 29 Square numbers less than 30 are 1, 4, 9, 16 and 25.
There are 18 that are less than 30.
23 and 29 are the two prime numbers greater than 20 but less than 30.
There are 30 whole numbers that are odd numbers less than 60 which are also positive. Otherwise, there are infinitely many of them.
The natural numbers are the counting numbers. Therefore, the natural numbers less than 31 are the numbers from 1 to 30.
There are infinitely many numbers that are less than 30 and so it would be impossible to list them all.
It is 25.
It is impossible for three prime numbers less than 30 to add up to 1955. After all, 30+30+30 is only 90.
The sum of all prime numbers less than 30 is 129.
Composite numbers greater than 20 and less than 30 are 21, 22, 24, 25, 26, 27, 28.
The numbers 23 and 29 are prime.