2
30
There are 18 composite numbers up to and including 30
There are infinitely many prime numbers which are greater 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.
There are two prime numbers between 20 and 30 which are 23 and 29
two numbers (31,37)
There are 2 prime numbers between 30 and 40: 31 and 37.
Ten whole numbers can be rounded to 30. The numbers are 25, 26, 27, 28, 29, 30, 31, 32, 33 and 34. There are an infinite number of complex numbers in the interval [25,35) that can be rounded to 30.
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.
10.
How many odd numbers are there from 16 to 30? Seven {7} odd numbers
There are 5 prime numbers from 30 to 50:31, 37, 41, 43 and 47