Hi Can anyone please give me a clarification on how to find the sum of consecutive odd/even numbers?

I read the thread below that

http://www.gmatclub.com/phpbb/viewtopic ... g+integers
ian7777 wrote:

The last thing to note is that if you have consecutive even numbers, or consecutive odds, after you subtract, you have to divide by 2, and then add one. There are 7 even integers from 22-34, because 34-12=12/2=6+1=7.

However, if I apply the same concept to find the sum of even integers from 5 to 9, inclusive, it doesn't seem to work. I was only able to find the sum of odd integers using that formula.

Are there any variations?

Thanks.

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