betting on cricket

has anyone here used any of the online betting places?

betting on australia to win the first test would yield 44% return on
investment.  Seems quite a safe bet.  of course if the unthinkable
happens a bet on india gets a return of 1000% on investment. but the
unthinkable isnt going to happen.

for some reason the probabilities of an aus win plus ind win plus draw
turn out to be greater than 1.  anyone know how this works?