The non-negative even integers less than 40 are:
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38
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set of all even natural numbers less than 10 = {2, 4, 6, 8}
2, 4
None. All counting numbers are even or odd.
all of them
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.)