1. The sum of odd numbers is odd.

Even and odd numbers are even numbers.

So there are at least 5 1 odd numbers.

The sum of 5 1 odd numbers is odd, so the odd number is 52, so the even number is at most 48.

2. Let the first odd number be x.

x+x+x+x+2+4+6 = 4x+ 12 = 4(x+3)

X is odd and x+3 is even.

So 4(x+3) can be divisible by 8.

3. The sum of odd numbers is odd.

The sum of five odd numbers is odd.

20 is an even number and cannot be.

4. If you answer a question correctly, add 5 points, and if you can't answer it, add 1 point, which are all odd numbers.

30 questions, even, odd and even.

At+15

Even odd = odd

So the score is amazing.

Odd numbers and odd numbers are both odd numbers.

199 1 individual score = odd number

5. No matter how you add it, there must be at least one pair of the last three numbers.

So it's impossible