Q: How many 4-digit positive even numbers are there?

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I believe there are 2 positive three-digit perfect cube numbers, that are even.

15

Infinitely many. If you restrict yourself to positive numbers only, but allow repetitions, then there are 15. If you disallow repetitions, only 2.

6

There are 100 even numbers between 1 and 200 (inclusive).

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It is positive. Any product of an even number of negative numbers will be positive, regardless of how many positive numbers you have. Similarly any product of an odd number of negative numbers will be negative, regardless of how many positive numbers you have.

I believe there are 2 positive three-digit perfect cube numbers, that are even.

15

There are 25 of them.

There is no end to the numbers of maths and there are many classifications of numbers, like primes, fractions, even, odd, positive, negative and others.

Infinitely many. If you restrict yourself to positive numbers only, but allow repetitions, then there are 15. If you disallow repetitions, only 2.

The sum of the first 1,000,000 positive even numbers is: 2 + 4 + 6 + 8 + ... + 2,000,000 The sum of the first 1,000,000 positive odd integers is: 1 + 3 + 5 + 7 + ... + 1,999,999 The difference between the two is: (2-1) + (4-3) + (6-5) + (8-7) + ... + (2,000,000-1,999,999). This is the same as: 1 + 1 + 1 + 1 + ... + 1. Well how many 1's are there? 1,000,000. So the difference is 1,000,000. Note that if the question asked for the difference between the sum of the first 1,000 positive even numbers and the sum of the first 1,000 positive odd numbers, the answer would be 1,000. The first n even numbers and odd numbers? n.

The first 10 positive whole numbers are: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.The even numbers among those are 2, 4, 6, 8, 10.So there are 5 ways of choosing an even number from among the first 10 positive whole numbers.

The assumption is that you are asking about any real numbers that have the digit zero in them, like 2507.8. There are infinitely many such numbers; there would be absolutely no end to a list of such numbers. The list would be infinitely long even if you are talking about just the positive integers.

Gee, let's see ... In 2, there is (1/2 of 2) even number. In 6, there are (1/2 of 6) even numbers. In 10, there are (1/2 of 10) even numbers. In 50, there are (1/2 of 50) even numbers. Seems to be pretty consistent ... half of all positive integers are even numbers. So in a googleplex, there are probably (1/2 of a googleplex) even numbers. Just a guess. Time does not permit counting them right now.

90

There are infinitely many of them so it is not possible to give a list. All numbers of the form 50+2n, where n is a positive integer, will fit the bill.