9, 15, 21, 25, 27
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None. All counting numbers are even or odd.
All numbers are either odd or even, none are both, so less than 30 there are 29 counting numbers that are either odd or even but not both. (Assuming you mean starting to count with 1.)
There are 15 prime numbers and 34 composite numbers because 1 is not considered to be a prime or composite number
The natural numbers are the counting numbers. Therefore, the natural numbers less than 31 are the numbers from 1 to 30.
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