Why there is a big different in the calculation of lottery odds?

huh? im sorry, id love to help, but u need to make your question more understandable. anyways, your odds of winning would be 5/39 or if no one got them right, it would be a 15/39 chance of winning, if you see what I mean. take the 2 numbers next to the winning numbers, greater and lesser than the winning numbers, those are the close ones. so then your second chance of winning would be 15/39 good luck