Oh, what a happy little question! To find the sum of all the even numbers less than 30, we can start by listing them: 2, 4, 6, 8, and so on up to 28. Then, we can add them all up gently, like adding colors to a beautiful painting. The sum of all these even numbers is 210, creating a lovely harmony on our canvas of numbers.
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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.)