The 7s game has approximate odds that are... way, way off. 10 hexadecimal digits means 16 possibilities per digit. That's 16^10 = 1.09 x 10^12 possibilities.Of those, the possible combinations of wins are... well I can't remember how to calculate that :'( But there are 10 digits, need three 7s... so that's what, 10 choose 3 (nCr)?How exactly did you calculate an approximate 1 in 40 chance of winning...?