The reason they're guaranted in the last 3:-

This show is reliant on the banter between the 3 judges its what makes the ratings for them. If one judge was without an act it would ruin the show which is why Simon is guaranteed to lose an act next week and its highly unlikely that act will be Leonna.

Look at previous x factor's, the last 3 are always one from each category.

They're down to 8/1 now and with Eton Road out they're guaranteed in the last 3

The likelyhood is that they won't be in the bottom two, they never have been yet and both Ray and Eton Road have. Ray is odds on to be in the bottom two this week and if The Mcdonalds are as well then the casting vote will be with Sharon who seems sided with Louis at the moment.

You have to also remember that either this week or next week the judges voting stop and its all down to public vote.

Ladbrokes have now cut the odds from 33/1 to 25/1, still good value when VC are taking no chances and offering only 10/1

This sort of bet doesn't come along very often and its the best kind.

X factor The Mcdonald Brothers to win, since being slated on TV by Simon Cowell they have ammassed a huge fanbase and are looking like shock winners. The bookies will be slashing their odds very quickly and here's why:-

Cast your vote
Who is your favourite?
Results: Votes   Per cent
Ben Mills 5,808 13%
Eton Road 5,580 12%
Leona Lewis 9,010 20%
The MacDonald Brothers 17,241 38%
Raymond Quinn 5,536 12%
Robert Allen 2,695 5%

Total votes: 45,870

http://entertainment.aol.co.uk/the-x-factor-who-is-your/article/20061110054509990001

You can still get 33/1 with Ladbrokes but I doubt that will be around for long, they are likely to be around 6/1 by this time next week so get on! - if everyone who bets on them votes on them as well how can they lose?