AGAIN NOT TO BE TAKEN SERIOUSLY
Statement of the theorem:
1) No host can win a World Cup
2) If a country is one of the hosts, it can win only if the final is in one of the other co-host countries.
As we will see, this had a 100 percent success rate until 2007. Dhoni and Co spoiled it in 2011, so some other theorem will have to be created.
Going over the results;
1975: WI won in Eng
1979: WI won in Eng
1983: Ind won in Eng
1987: Aus won in Ind
1992: Pak won in Aus
1996: SL (host) won in the final held in Pak
1999: Aus won in Eng
2003: Aus won in SA
2007: Aus won in WI
(9 out of 9 so far)
2011: Ind won in Ind (though if SL had won the theorem would still be valid)
Anyway, we still have a 90 percent success rate. So we can be quite confident that Australia will not win the final.