Is the sum of 1 + 2 + 3 +. + 99 + 100 odd or even? Write the reason

Is the sum of 1 + 2 + 3 +. + 99 + 100 odd or even? Write the reason

Among the 100 numbers, there are 50 even numbers and 50 odd numbers,
The sum of even numbers is even, and the sum of 50 odd numbers is even
The sum is even

Is the sum of 1 + 2 + 3. + 99 + 100 odd or even

There are 50 odd numbers
That is, the number is even
So sum is even

Is the sum of 99 odd numbers plus 99 even numbers odd or even? Why?

It is odd number. Because odd number and odd number add, the last number is odd number. Even number is even number regardless of how many add. Odd number and even number add must be odd number