Prop bet and a math ?

[oldmangrimis]

the Q,7,2 prop bet is when you bet that a Q or 7 or 2 will come out on the flop any one of those card and any three cards for that matter. i her this is a good prop bet but want to know if any of you math wiz could help me out of the odds. is it better then 50% and would you be able to le me knoe if it what it is.

I know the Avg winning 2 card in hold'em is Q7 but what is ine ave 5 card hands

thanks math wiz out there