This document provides the mathematics behind the calculations of winning each division of Ozlotto. https://thelott.com/oz-lotto/how-to-win
An introduction to Combinations and how they work is also included.
This is an excellent exercise for students studying Permutations and Combinations in senior secondary school to really get an understanding of how combinations work.
To win Division 1 in Oz Lotto, your 7 selected numbers need to match the 7 winning numbers for that draw. However you can win a prize with as little as 3 winning numbers plus 1 supplementary number in a single game.