If it is pure chance (1 in 3 each question) I reckon you would need to play for over 29 years to expect to have got 7/7 at least once.
Quote from: Tim on 08 July, 2011, 01:09:53 pmIf it is pure chance (1 in 3 each question) I reckon you would need to play for over 29 years to expect to have got 7/7 at least once.37 / 52 =~ 42 years